87913431 has 10 divisors (see below), whose sum is σ = 131327592. Its totient is φ = 58608900.

The previous prime is 87913421. The next prime is 87913439. The reversal of 87913431 is 13431978.

It is a happy number.

It is not a de Polignac number, because 87913431 - 2⁶ = 87913367 is a prime.

It is a super-2 number, since 2×87913431² = 15457542700383522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87913439) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 542595 + ... + 542756.

Almost surely, 2^87913431 is an apocalyptic number.

87913431 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

87913431 is a deficient number, since it is larger than the sum of its proper divisors (43414161).

87913431 is a wasteful number, since it uses less digits than its factorization.

87913431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085363 (or 1085354 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 87913431 is about 9376.2162411071. The cubic root of 87913431 is about 444.6501159174.

The spelling of 87913431 in words is "eighty-seven million, nine hundred thirteen thousand, four hundred thirty-one".