616591957 has 2 divisors, whose sum is σ = 616591958. Its totient is φ = 616591956.

The previous prime is 616591901. The next prime is 616592017. The reversal of 616591957 is 759195616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 386948241 + 229643716 = 19671^2 + 15154^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-616591957 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 616591957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616531957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308295978 + 308295979.

It is an arithmetic number, because the mean of its divisors is an integer number (308295979).

Almost surely, 2^616591957 is an apocalyptic number.

It is an amenable number.

616591957 is a deficient number, since it is larger than the sum of its proper divisors (1).

616591957 is an equidigital number, since it uses as much as digits as its factorization.

616591957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 510300, while the sum is 49.

The square root of 616591957 is about 24831.2697420007. The cubic root of 616591957 is about 851.1366371738.

The spelling of 616591957 in words is "six hundred sixteen million, five hundred ninety-one thousand, nine hundred fifty-seven".