616680731 has 2 divisors, whose sum is σ = 616680732. Its totient is φ = 616680730.

The previous prime is 616680721. The next prime is 616680751. The reversal of 616680731 is 137086616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 616680731 - 2¹⁸ = 616418587 is a prime.

It is a super-2 number, since 2×616680731² = 760590247973388722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (616680721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308340365 + 308340366.

It is an arithmetic number, because the mean of its divisors is an integer number (308340366).

Almost surely, 2^616680731 is an apocalyptic number.

616680731 is a deficient number, since it is larger than the sum of its proper divisors (1).

616680731 is an equidigital number, since it uses as much as digits as its factorization.

616680731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 616680731 is about 24833.0572221787. The cubic root of 616680731 is about 851.1774827590.

The spelling of 616680731 in words is "six hundred sixteen million, six hundred eighty thousand, seven hundred thirty-one".