88661531 has 6 divisors (see below), whose sum is σ = 103136940. Its totient is φ = 75995556.

The previous prime is 88661491. The next prime is 88661539. The reversal of 88661531 is 13516688.

It is a happy number.

It is not a de Polignac number, because 88661531 - 2²⁶ = 21552667 is a prime.

It is a super-2 number, since 2×88661531² = 15721734158527922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (88661539) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 904661 + ... + 904758.

It is an arithmetic number, because the mean of its divisors is an integer number (17189490).

Almost surely, 2^88661531 is an apocalyptic number.

88661531 is a deficient number, since it is larger than the sum of its proper divisors (14475409).

88661531 is a wasteful number, since it uses less digits than its factorization.

88661531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809433 (or 1809426 counting only the distinct ones).

The product of its digits is 34560, while the sum is 38.

The square root of 88661531 is about 9416.0252229909. The cubic root of 88661531 is about 445.9078063575.

The spelling of 88661531 in words is "eighty-eight million, six hundred sixty-one thousand, five hundred thirty-one".