87400531 has 2 divisors, whose sum is σ = 87400532. Its totient is φ = 87400530.

The previous prime is 87400507. The next prime is 87400571. The reversal of 87400531 is 13500478.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87400531 - 2⁵ = 87400499 is a prime.

It is a super-2 number, since 2×87400531² = 15277705638163922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87400531.

It is not a weakly prime, because it can be changed into another prime (87400571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43700265 + 43700266.

It is an arithmetic number, because the mean of its divisors is an integer number (43700266).

Almost surely, 2^87400531 is an apocalyptic number.

87400531 is a deficient number, since it is larger than the sum of its proper divisors (1).

87400531 is an equidigital number, since it uses as much as digits as its factorization.

87400531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 87400531 is about 9348.8251133498. The cubic root of 87400531 is about 443.7837105647.

The spelling of 87400531 in words is "eighty-seven million, four hundred thousand, five hundred thirty-one".