31291797357793 has 4 divisors (see below), whose sum is σ = 35762054123200. Its totient is φ = 26821540592388.

The previous prime is 31291797357787. The next prime is 31291797357811. The reversal of 31291797357793 is 39775379719213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31291797357793 - 2²¹ = 31291795260641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31291797357713) 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 in 3 ways as a sum of consecutive naturals, for example, 2235128382693 + ... + 2235128382706.

It is an arithmetic number, because the mean of its divisors is an integer number (8940513530800).

Almost surely, 2^{31291797357793} is an apocalyptic number.

It is an amenable number.

31291797357793 is a deficient number, since it is larger than the sum of its proper divisors (4470256765407).

31291797357793 is an equidigital number, since it uses as much as digits as its factorization.

31291797357793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4470256765406.

The product of its digits is 472588830, while the sum is 73.

The spelling of 31291797357793 in words is "thirty-one trillion, two hundred ninety-one billion, seven hundred ninety-seven million, three hundred fifty-seven thousand, seven hundred ninety-three".