88431561 has 16 divisors (see below), whose sum is σ = 135237120. Its totient is φ = 57052080.

The previous prime is 88431533. The next prime is 88431583. The reversal of 88431561 is 16513488.

It is not a de Polignac number, because 88431561 - 2¹⁹ = 87907273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (88431061) 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, 51990 + ... + 53663.

It is an arithmetic number, because the mean of its divisors is an integer number (8452320).

Almost surely, 2^88431561 is an apocalyptic number.

It is an amenable number.

88431561 is a deficient number, since it is larger than the sum of its proper divisors (46805559).

88431561 is a wasteful number, since it uses less digits than its factorization.

88431561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105693 (or 105687 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 88431561 is about 9403.8056657930. The cubic root of 88431561 is about 445.5219411248.

It can be divided in two parts, 8843 and 1561, that added together give a square (10404 = 102²).

The spelling of 88431561 in words is "eighty-eight million, four hundred thirty-one thousand, five hundred sixty-one".