31287980077 has 2 divisors, whose sum is σ = 31287980078. Its totient is φ = 31287980076.

The previous prime is 31287980069. The next prime is 31287980083. The reversal of 31287980077 is 77008978213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20399266276 + 10888713801 = 142826^2 + 104349^2 .

It is a cyclic number.

It is not a de Polignac number, because 31287980077 - 2³ = 31287980069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31287980777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15643990038 + 15643990039.

It is an arithmetic number, because the mean of its divisors is an integer number (15643990039).

Almost surely, 2^31287980077 is an apocalyptic number.

It is an amenable number.

31287980077 is a deficient number, since it is larger than the sum of its proper divisors (1).

31287980077 is an equidigital number, since it uses as much as digits as its factorization.

31287980077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1185408, while the sum is 52.

The spelling of 31287980077 in words is "thirty-one billion, two hundred eighty-seven million, nine hundred eighty thousand, seventy-seven".