680939543 has 2 divisors, whose sum is σ = 680939544. Its totient is φ = 680939542.

The previous prime is 680939531. The next prime is 680939551. The reversal of 680939543 is 345939086.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680939543 is a prime.

It is a super-2 number, since 2×680939543² = 927357322442097698, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680932543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340469771 + 340469772.

It is an arithmetic number, because the mean of its divisors is an integer number (340469772).

Almost surely, 2^680939543 is an apocalyptic number.

680939543 is a deficient number, since it is larger than the sum of its proper divisors (1).

680939543 is an equidigital number, since it uses as much as digits as its factorization.

680939543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 47.

The square root of 680939543 is about 26094.8183170529. The cubic root of 680939543 is about 879.7707490807.

The spelling of 680939543 in words is "six hundred eighty million, nine hundred thirty-nine thousand, five hundred forty-three".