631611977 has 2 divisors, whose sum is σ = 631611978. Its totient is φ = 631611976.

The previous prime is 631611961. The next prime is 631611983. The reversal of 631611977 is 779116136.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 592873801 + 38738176 = 24349^2 + 6224^2 .

It is a cyclic number.

It is not a de Polignac number, because 631611977 - 2⁴ = 631611961 is a prime.

It is a Chen prime.

It is equal to p_32886815 and since 631611977 and 32886815 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (631611997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315805988 + 315805989.

It is an arithmetic number, because the mean of its divisors is an integer number (315805989).

Almost surely, 2^631611977 is an apocalyptic number.

It is an amenable number.

631611977 is a deficient number, since it is larger than the sum of its proper divisors (1).

631611977 is an equidigital number, since it uses as much as digits as its factorization.

631611977 is an odious number, because the sum of its binary digits is odd.

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

The square root of 631611977 is about 25131.8916319484. The cubic root of 631611977 is about 857.9924223643.

The spelling of 631611977 in words is "six hundred thirty-one million, six hundred eleven thousand, nine hundred seventy-seven".