311031004021993 has 4 divisors (see below), whose sum is σ = 324554091153408. Its totient is φ = 297507916890580.

The previous prime is 311031004021961. The next prime is 311031004021999. The reversal of 311031004021993 is 399120400130113.

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 311031004021993 - 2⁵ = 311031004021961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311031004021999) 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, 6761543565673 + ... + 6761543565718.

It is an arithmetic number, because the mean of its divisors is an integer number (81138522788352).

Almost surely, 2^{311031004021993} is an apocalyptic number.

It is an amenable number.

311031004021993 is a deficient number, since it is larger than the sum of its proper divisors (13523087131415).

311031004021993 is a wasteful number, since it uses less digits than its factorization.

311031004021993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13523087131414.

The product of its (nonzero) digits is 17496, while the sum is 37.

The spelling of 311031004021993 in words is "three hundred eleven trillion, thirty-one billion, four million, twenty-one thousand, nine hundred ninety-three".