680489531 has 2 divisors, whose sum is σ = 680489532. Its totient is φ = 680489530.

The previous prime is 680489521. The next prime is 680489561. The reversal of 680489531 is 135984086.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 680489531 - 2¹⁰ = 680488507 is a prime.

It is a super-2 number, since 2×680489531² = 926132003601199922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (680489521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340244765 + 340244766.

It is an arithmetic number, because the mean of its divisors is an integer number (340244766).

Almost surely, 2^680489531 is an apocalyptic number.

680489531 is a deficient number, since it is larger than the sum of its proper divisors (1).

680489531 is an equidigital number, since it uses as much as digits as its factorization.

680489531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 680489531 is about 26086.1942605663. The cubic root of 680489531 is about 879.5769018957.

Subtracting from 680489531 its reverse (135984086), we obtain a palindrome (544505445).

The spelling of 680489531 in words is "six hundred eighty million, four hundred eighty-nine thousand, five hundred thirty-one".