88431891 has 8 divisors (see below), whose sum is σ = 118591440. Its totient is φ = 58613472.

The previous prime is 88431881. The next prime is 88431899. The reversal of 88431891 is 19813488.

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

It is not a de Polignac number, because 88431891 - 2¹⁵ = 88399123 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (88431899) 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 7 ways as a sum of consecutive naturals, for example, 84676 + ... + 85713.

It is an arithmetic number, because the mean of its divisors is an integer number (14823930).

Almost surely, 2^88431891 is an apocalyptic number.

88431891 is the 5948-th centered pentagonal number.

88431891 is a deficient number, since it is larger than the sum of its proper divisors (30159549).

88431891 is a wasteful number, since it uses less digits than its factorization.

88431891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170565.

The product of its digits is 55296, while the sum is 42.

The square root of 88431891 is about 9403.8232118644. The cubic root of 88431891 is about 445.5224953088.

The spelling of 88431891 in words is "eighty-eight million, four hundred thirty-one thousand, eight hundred ninety-one".