88911561 has 4 divisors (see below), whose sum is σ = 118548752. Its totient is φ = 59274372.

The previous prime is 88911553. The next prime is 88911601. The reversal of 88911561 is 16511988.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 88911561 - 2³ = 88911553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (88911521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14818591 + ... + 14818596.

It is an arithmetic number, because the mean of its divisors is an integer number (29637188).

Almost surely, 2^88911561 is an apocalyptic number.

It is an amenable number.

88911561 is a deficient number, since it is larger than the sum of its proper divisors (29637191).

88911561 is a wasteful number, since it uses less digits than its factorization.

88911561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29637190.

The product of its digits is 17280, while the sum is 39.

The square root of 88911561 is about 9429.2927094242. The cubic root of 88911561 is about 446.3265738081.

The spelling of 88911561 in words is "eighty-eight million, nine hundred eleven thousand, five hundred sixty-one".