377989961 has 2 divisors, whose sum is σ = 377989962. Its totient is φ = 377989960.

The previous prime is 377989939. The next prime is 377989979. The reversal of 377989961 is 169989773.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 329604025 + 48385936 = 18155^2 + 6956^2 .

It is an emirp because it is prime and its reverse (169989773) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 377989961 - 2¹⁸ = 377727817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 377989961.

It is not a weakly prime, because it can be changed into another prime (377989901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 188994980 + 188994981.

It is an arithmetic number, because the mean of its divisors is an integer number (188994981).

Almost surely, 2^377989961 is an apocalyptic number.

It is an amenable number.

377989961 is a deficient number, since it is larger than the sum of its proper divisors (1).

377989961 is an equidigital number, since it uses as much as digits as its factorization.

377989961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5143824, while the sum is 59.

The square root of 377989961 is about 19441.9639182877. The cubic root of 377989961 is about 723.0362782916.

The spelling of 377989961 in words is "three hundred seventy-seven million, nine hundred eighty-nine thousand, nine hundred sixty-one".