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99642049 = 13172319603
BaseRepresentation
bin1011111000001…
…10101011000001
320221111100012021
411330012223001
5201002021144
613515401441
72316641413
oct574065301
9227440167
1099642049
1151277601
1229453281
13178498c0
14d33a9b3
158b33884
hex5f06ac1

99642049 has 16 divisors (see below), whose sum is σ = 118564992. Its totient is φ = 82798848.

The previous prime is 99642043. The next prime is 99642071. The reversal of 99642049 is 94024699.

It is a 5-Lehmer number, since φ(99642049) divides (99642049-1)5.

It is a cyclic number.

It is not a de Polignac number, because 99642049 - 215 = 99609281 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99641996 and 99642014.

It is not an unprimeable number, because it can be changed into a prime (99642043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4719 + ... + 14884.

It is an arithmetic number, because the mean of its divisors is an integer number (7410312).

Almost surely, 299642049 is an apocalyptic number.

It is an amenable number.

99642049 is a deficient number, since it is larger than the sum of its proper divisors (18922943).

99642049 is a wasteful number, since it uses less digits than its factorization.

99642049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19656.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 99642049 is about 9982.0864051560. The cubic root of 99642049 is about 463.6044007872.

The spelling of 99642049 in words is "ninety-nine million, six hundred forty-two thousand, forty-nine".

Divisors: 1 13 17 23 221 299 391 5083 19603 254839 333251 450869 4332263 5861297 7664773 99642049