31249027946881 has 2 divisors, whose sum is σ = 31249027946882. Its totient is φ = 31249027946880.

The previous prime is 31249027946861. The next prime is 31249027946897. The reversal of 31249027946881 is 18864972094213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19035289073025 + 12213738873856 = 4362945^2 + 3494816^2 .

It is a cyclic number.

It is not a de Polignac number, because 31249027946881 - 2⁵ = 31249027946849 is a prime.

It is a super-2 number, since 2×31249027946881² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31249027946831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15624513973440 + 15624513973441.

It is an arithmetic number, because the mean of its divisors is an integer number (15624513973441).

Almost surely, 2^{31249027946881} is an apocalyptic number.

It is an amenable number.

31249027946881 is a deficient number, since it is larger than the sum of its proper divisors (1).

31249027946881 is an equidigital number, since it uses as much as digits as its factorization.

31249027946881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41803776, while the sum is 64.

The spelling of 31249027946881 in words is "thirty-one trillion, two hundred forty-nine billion, twenty-seven million, nine hundred forty-six thousand, eight hundred eighty-one".