310913993 has 4 divisors (see below), whose sum is σ = 334830468. Its totient is φ = 286997520.

The previous prime is 310913957. The next prime is 310914001. The reversal of 310913993 is 399319013.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48052624 + 262861369 = 6932^2 + 16213^2 .

It is a cyclic number.

It is not a de Polignac number, because 310913993 - 2¹⁶ = 310848457 is a prime.

It is a super-2 number, since 2×310913993² = 193335022086408098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (310913903) 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, 11958218 + ... + 11958243.

It is an arithmetic number, because the mean of its divisors is an integer number (83707617).

Almost surely, 2^310913993 is an apocalyptic number.

It is an amenable number.

310913993 is a deficient number, since it is larger than the sum of its proper divisors (23916475).

310913993 is a wasteful number, since it uses less digits than its factorization.

310913993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23916474.

The product of its (nonzero) digits is 19683, while the sum is 38.

The square root of 310913993 is about 17632.7534151646. The cubic root of 310913993 is about 677.4544337396.

The spelling of 310913993 in words is "three hundred ten million, nine hundred thirteen thousand, nine hundred ninety-three".