31677230821 has 2 divisors, whose sum is σ = 31677230822. Its totient is φ = 31677230820.

The previous prime is 31677230813. The next prime is 31677230843. The reversal of 31677230821 is 12803277613.

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., 31582265796 + 94965025 = 177714^2 + 9745^2 .

It is a cyclic number.

It is not a de Polignac number, because 31677230821 - 2³ = 31677230813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31677230881) 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, 15838615410 + 15838615411.

It is an arithmetic number, because the mean of its divisors is an integer number (15838615411).

Almost surely, 2^31677230821 is an apocalyptic number.

It is an amenable number.

31677230821 is a deficient number, since it is larger than the sum of its proper divisors (1).

31677230821 is an equidigital number, since it uses as much as digits as its factorization.

31677230821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 40.

The spelling of 31677230821 in words is "thirty-one billion, six hundred seventy-seven million, two hundred thirty thousand, eight hundred twenty-one".