31631606077 has 2 divisors, whose sum is σ = 31631606078. Its totient is φ = 31631606076.

The previous prime is 31631606023. The next prime is 31631606099. The reversal of 31631606077 is 77060613613.

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., 30371427076 + 1260179001 = 174274^2 + 35499^2 .

It is an emirp because it is prime and its reverse (77060613613) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31631606077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31631606177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15815803038 + 15815803039.

It is an arithmetic number, because the mean of its divisors is an integer number (15815803039).

Almost surely, 2^31631606077 is an apocalyptic number.

It is an amenable number.

31631606077 is a deficient number, since it is larger than the sum of its proper divisors (1).

31631606077 is an equidigital number, since it uses as much as digits as its factorization.

31631606077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 40.

The spelling of 31631606077 in words is "thirty-one billion, six hundred thirty-one million, six hundred six thousand, seventy-seven".