31431401977 has 2 divisors, whose sum is σ = 31431401978. Its totient is φ = 31431401976.

The previous prime is 31431401971. The next prime is 31431402007. The reversal of 31431401977 is 77910413413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18892777401 + 12538624576 = 137451^2 + 111976^2 .

It is a cyclic number.

It is not a de Polignac number, because 31431401977 - 2²⁷ = 31297184249 is a prime.

It is not a weakly prime, because it can be changed into another prime (31431401971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15715700988 + 15715700989.

It is an arithmetic number, because the mean of its divisors is an integer number (15715700989).

Almost surely, 2^31431401977 is an apocalyptic number.

It is an amenable number.

31431401977 is a deficient number, since it is larger than the sum of its proper divisors (1).

31431401977 is an equidigital number, since it uses as much as digits as its factorization.

31431401977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 40.

The spelling of 31431401977 in words is "thirty-one billion, four hundred thirty-one million, four hundred one thousand, nine hundred seventy-seven".