817252531 has 2 divisors, whose sum is σ = 817252532. Its totient is φ = 817252530.

The previous prime is 817252523. The next prime is 817252649. The reversal of 817252531 is 135252718.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 817252531 - 2³ = 817252523 is a prime.

It is a super-2 number, since 2×817252531² = 1335803398851811922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (817252231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408626265 + 408626266.

It is an arithmetic number, because the mean of its divisors is an integer number (408626266).

Almost surely, 2^817252531 is an apocalyptic number.

817252531 is a deficient number, since it is larger than the sum of its proper divisors (1).

817252531 is an equidigital number, since it uses as much as digits as its factorization.

817252531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 34.

The square root of 817252531 is about 28587.6289852796. The cubic root of 817252531 is about 934.9436251482.

The spelling of 817252531 in words is "eight hundred seventeen million, two hundred fifty-two thousand, five hundred thirty-one".