89951561 has 16 divisors (see below), whose sum is σ = 105414144. Its totient is φ = 75155904.

The previous prime is 89951527. The next prime is 89951569. The reversal of 89951561 is 16515998.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89951561 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (89951569) 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, 122351 + ... + 123083.

It is an arithmetic number, because the mean of its divisors is an integer number (6588384).

Almost surely, 2^89951561 is an apocalyptic number.

It is an amenable number.

89951561 is a deficient number, since it is larger than the sum of its proper divisors (15462583).

89951561 is a wasteful number, since it uses less digits than its factorization.

89951561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160.

The product of its digits is 97200, while the sum is 44.

The square root of 89951561 is about 9484.2796774452. The cubic root of 89951561 is about 448.0600621668.

The spelling of 89951561 in words is "eighty-nine million, nine hundred fifty-one thousand, five hundred sixty-one".