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99871801 = 3131710163
BaseRepresentation
bin1011111001111…
…10110000111001
320221221000100121
411330332300321
5201031344201
613524333241
72321616301
oct574766071
9227830317
1099871801
1151414187
1229544221
13178ca353
14d39a601
158b7b9a1
hex5f3ec39

99871801 has 8 divisors (see below), whose sum is σ = 103428864. Its totient is φ = 96335760.

The previous prime is 99871789. The next prime is 99871813. The reversal of 99871801 is 10817899.

It is an interprime number because it is at equal distance from previous prime (99871789) and next prime (99871813).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99871801 - 211 = 99869753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99871841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4746 + ... + 14908.

It is an arithmetic number, because the mean of its divisors is an integer number (12928608).

Almost surely, 299871801 is an apocalyptic number.

99871801 is the 6321-st centered pentagonal number.

It is an amenable number.

99871801 is a deficient number, since it is larger than the sum of its proper divisors (3557063).

99871801 is a wasteful number, since it uses less digits than its factorization.

99871801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10511.

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 99871801 is about 9993.5879943092. The cubic root of 99871801 is about 463.9604495247.

The spelling of 99871801 in words is "ninety-nine million, eight hundred seventy-one thousand, eight hundred one".

Divisors: 1 31 317 9827 10163 315053 3221671 99871801