87438731 has 2 divisors, whose sum is σ = 87438732. Its totient is φ = 87438730.

The previous prime is 87438727. The next prime is 87438739. The reversal of 87438731 is 13783478.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87438731 - 2² = 87438727 is a prime.

It is a super-2 number, since 2×87438731² = 15291063357780722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87438739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43719365 + 43719366.

It is an arithmetic number, because the mean of its divisors is an integer number (43719366).

Almost surely, 2^87438731 is an apocalyptic number.

87438731 is a deficient number, since it is larger than the sum of its proper divisors (1).

87438731 is an equidigital number, since it uses as much as digits as its factorization.

87438731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 41.

The square root of 87438731 is about 9350.8679276311. The cubic root of 87438731 is about 443.8483557423.

The spelling of 87438731 in words is "eighty-seven million, four hundred thirty-eight thousand, seven hundred thirty-one".