31946354993 has 4 divisors (see below), whose sum is σ = 36510120000. Its totient is φ = 27382589988.

The previous prime is 31946354989. The next prime is 31946355017. The reversal of 31946354993 is 39945364913.

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 31946354993 - 2² = 31946354989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31946254993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2281882493 + ... + 2281882506.

It is an arithmetic number, because the mean of its divisors is an integer number (9127530000).

Almost surely, 2^31946354993 is an apocalyptic number.

It is an amenable number.

31946354993 is a deficient number, since it is larger than the sum of its proper divisors (4563765007).

31946354993 is an equidigital number, since it uses as much as digits as its factorization.

31946354993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4563765006.

The product of its digits is 9447840, while the sum is 56.

The spelling of 31946354993 in words is "thirty-one billion, nine hundred forty-six million, three hundred fifty-four thousand, nine hundred ninety-three".