680531 has 2 divisors, whose sum is σ = 680532. Its totient is φ = 680530.

The previous prime is 680509. The next prime is 680539. The reversal of 680531 is 135086.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680531 is a prime.

It is a super-2 number, since 2×680531² = 926244883922, which contains 22 as substring.

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 680497 and 680506.

It is not a weakly prime, because it can be changed into another prime (680539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340265 + 340266.

It is an arithmetic number, because the mean of its divisors is an integer number (340266).

2⁶⁸⁰⁵³¹ is an apocalyptic number.

680531 is a deficient number, since it is larger than the sum of its proper divisors (1).

680531 is an equidigital number, since it uses as much as digits as its factorization.

680531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 680531 is about 824.9430283359. The cubic root of 680531 is about 87.9594768658.

The spelling of 680531 in words is "six hundred eighty thousand, five hundred thirty-one".