87109731 has 12 divisors (see below), whose sum is σ = 125945560. Its totient is φ = 58017600.

The previous prime is 87109727. The next prime is 87109733. The reversal of 87109731 is 13790178.

It is not a de Polignac number, because 87109731 - 2² = 87109727 is a prime.

It is a super-2 number, since 2×87109731² = 15176210469784722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87109733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6780 + ... + 14838.

Almost surely, 2^87109731 is an apocalyptic number.

87109731 is a deficient number, since it is larger than the sum of its proper divisors (38835829).

87109731 is a wasteful number, since it uses less digits than its factorization.

87109731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9266 (or 9263 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 87109731 is about 9333.2593985167. The cubic root of 87109731 is about 443.2909763491.

The spelling of 87109731 in words is "eighty-seven million, one hundred nine thousand, seven hundred thirty-one".