87751931 has 8 divisors (see below), whose sum is σ = 90786528. Its totient is φ = 84760000.

The previous prime is 87751921. The next prime is 87751933. The reversal of 87751931 is 13915778.

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

It is a cyclic number.

It is not a de Polignac number, because 87751931 - 2¹⁰ = 87750907 is a prime.

It is a super-2 number, since 2×87751931² = 15400802788457522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87751933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6455 + ... + 14736.

It is an arithmetic number, because the mean of its divisors is an integer number (11348316).

Almost surely, 2^87751931 is an apocalyptic number.

87751931 is a deficient number, since it is larger than the sum of its proper divisors (3034597).

87751931 is a wasteful number, since it uses less digits than its factorization.

87751931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21333.

The product of its digits is 52920, while the sum is 41.

The square root of 87751931 is about 9367.6000661856. The cubic root of 87751931 is about 444.3776698269.

The spelling of 87751931 in words is "eighty-seven million, seven hundred fifty-one thousand, nine hundred thirty-one".