31121011247 has 2 divisors, whose sum is σ = 31121011248. Its totient is φ = 31121011246.

The previous prime is 31121011219. The next prime is 31121011249. The reversal of 31121011247 is 74211012113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31121011247 - 2³⁴ = 13941142063 is a prime.

Together with 31121011249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31121011249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560505623 + 15560505624.

It is an arithmetic number, because the mean of its divisors is an integer number (15560505624).

Almost surely, 2^31121011247 is an apocalyptic number.

31121011247 is a deficient number, since it is larger than the sum of its proper divisors (1).

31121011247 is an equidigital number, since it uses as much as digits as its factorization.

31121011247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 23.

The spelling of 31121011247 in words is "thirty-one billion, one hundred twenty-one million, eleven thousand, two hundred forty-seven".