680239481 has 2 divisors, whose sum is σ = 680239482. Its totient is φ = 680239480.

The previous prime is 680239397. The next prime is 680239493. The reversal of 680239481 is 184932086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 676000000 + 4239481 = 26000^2 + 2059^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680239481 is a prime.

It is a super-2 number, since 2×680239481² = 925451503022298722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (680232481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340119740 + 340119741.

It is an arithmetic number, because the mean of its divisors is an integer number (340119741).

Almost surely, 2^680239481 is an apocalyptic number.

It is an amenable number.

680239481 is a deficient number, since it is larger than the sum of its proper divisors (1).

680239481 is an equidigital number, since it uses as much as digits as its factorization.

680239481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 680239481 is about 26081.4010551581. The cubic root of 680239481 is about 879.4691534102.

The spelling of 680239481 in words is "six hundred eighty million, two hundred thirty-nine thousand, four hundred eighty-one".