616311977 has 2 divisors, whose sum is σ = 616311978. Its totient is φ = 616311976.

The previous prime is 616311967. The next prime is 616312001. The reversal of 616311977 is 779113616.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 391881616 + 224430361 = 19796^2 + 14981^2 .

It is a cyclic number.

It is not a de Polignac number, because 616311977 - 2²⁸ = 347876521 is a prime.

It is not a weakly prime, because it can be changed into another prime (616311967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308155988 + 308155989.

It is an arithmetic number, because the mean of its divisors is an integer number (308155989).

Almost surely, 2^616311977 is an apocalyptic number.

It is an amenable number.

616311977 is a deficient number, since it is larger than the sum of its proper divisors (1).

616311977 is an equidigital number, since it uses as much as digits as its factorization.

616311977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47628, while the sum is 41.

The square root of 616311977 is about 24825.6314521907. The cubic root of 616311977 is about 851.0077905835.

The spelling of 616311977 in words is "six hundred sixteen million, three hundred eleven thousand, nine hundred seventy-seven".