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99985551 = 3174194679
BaseRepresentation
bin1011111010110…
…10100010001111
320222010210101120
411331122202033
5201044014201
613531012023
72322602031
oct575324217
9228123346
1099985551
1151491696
122959a013
131793a063
14d3c9c51
158ba0536
hex5f5a88f

99985551 has 16 divisors (see below), whose sum is σ = 141523200. Its totient is φ = 62572928.

The previous prime is 99985549. The next prime is 99985559. The reversal of 99985551 is 15558999.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 99985551 - 21 = 99985549 is a prime.

It is a super-2 number, since 2×999855512 = 19994220817547202, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 99985494 and 99985503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99985559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19030 + ... + 23708.

It is an arithmetic number, because the mean of its divisors is an integer number (8845200).

Almost surely, 299985551 is an apocalyptic number.

99985551 is a deficient number, since it is larger than the sum of its proper divisors (41537649).

99985551 is a wasteful number, since it uses less digits than its factorization.

99985551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5118.

The product of its digits is 729000, while the sum is 51.

The square root of 99985551 is about 9999.2775239014. The cubic root of 99985551 is about 464.1365268455.

The spelling of 99985551 in words is "ninety-nine million, nine hundred eighty-five thousand, five hundred fifty-one".

Divisors: 1 3 17 51 419 1257 4679 7123 14037 21369 79543 238629 1960501 5881503 33328517 99985551