31129274779 has 2 divisors, whose sum is σ = 31129274780. Its totient is φ = 31129274778.

The previous prime is 31129274717. The next prime is 31129274783. The reversal of 31129274779 is 97747292113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31129274779 - 2²⁵ = 31095720347 is a prime.

It is not a weakly prime, because it can be changed into another prime (31129278779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15564637389 + 15564637390.

It is an arithmetic number, because the mean of its divisors is an integer number (15564637390).

Almost surely, 2^31129274779 is an apocalyptic number.

31129274779 is a deficient number, since it is larger than the sum of its proper divisors (1).

31129274779 is an equidigital number, since it uses as much as digits as its factorization.

31129274779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1333584, while the sum is 52.

The spelling of 31129274779 in words is "thirty-one billion, one hundred twenty-nine million, two hundred seventy-four thousand, seven hundred seventy-nine".