86720531 has 2 divisors, whose sum is σ = 86720532. Its totient is φ = 86720530.

The previous prime is 86720521. The next prime is 86720537. The reversal of 86720531 is 13502768.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86720531 - 2¹⁴ = 86704147 is a prime.

It is a super-2 number, since 2×86720531² = 15040900993843922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (86720537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43360265 + 43360266.

It is an arithmetic number, because the mean of its divisors is an integer number (43360266).

Almost surely, 2^86720531 is an apocalyptic number.

86720531 is a deficient number, since it is larger than the sum of its proper divisors (1).

86720531 is an equidigital number, since it uses as much as digits as its factorization.

86720531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 86720531 is about 9312.3858919184. The cubic root of 86720531 is about 442.6297932852.

The spelling of 86720531 in words is "eighty-six million, seven hundred twenty thousand, five hundred thirty-one".