88991131 has 4 divisors (see below), whose sum is σ = 90450064. Its totient is φ = 87532200.

The previous prime is 88991129. The next prime is 88991183. The reversal of 88991131 is 13119988.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 88991131 - 2¹ = 88991129 is a prime.

It is a super-2 number, since 2×88991131² = 15838842793318322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (88991101) 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, 729375 + ... + 729496.

It is an arithmetic number, because the mean of its divisors is an integer number (22612516).

Almost surely, 2^88991131 is an apocalyptic number.

88991131 is a deficient number, since it is larger than the sum of its proper divisors (1458933).

88991131 is a wasteful number, since it uses less digits than its factorization.

88991131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458932.

The product of its digits is 15552, while the sum is 40.

The square root of 88991131 is about 9433.5110642857. The cubic root of 88991131 is about 446.4596784200.

The spelling of 88991131 in words is "eighty-eight million, nine hundred ninety-one thousand, one hundred thirty-one".