31368261877 has 2 divisors, whose sum is σ = 31368261878. Its totient is φ = 31368261876.

The previous prime is 31368261851. The next prime is 31368261901. The reversal of 31368261877 is 77816286313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18472615396 + 12895646481 = 135914^2 + 113559^2 .

It is a cyclic number.

It is not a de Polignac number, because 31368261877 - 2¹⁹ = 31367737589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31368261577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15684130938 + 15684130939.

It is an arithmetic number, because the mean of its divisors is an integer number (15684130939).

Almost surely, 2^31368261877 is an apocalyptic number.

It is an amenable number.

31368261877 is a deficient number, since it is larger than the sum of its proper divisors (1).

31368261877 is an equidigital number, since it uses as much as digits as its factorization.

31368261877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2032128, while the sum is 52.

The spelling of 31368261877 in words is "thirty-one billion, three hundred sixty-eight million, two hundred sixty-one thousand, eight hundred seventy-seven".