313561999 has 4 divisors (see below), whose sum is σ = 314678160. Its totient is φ = 312445840.

The previous prime is 313561979. The next prime is 313562017. The reversal of 313561999 is 999165313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999165313 = 6373 ⋅156781.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313561999 is a prime.

It is a super-2 number, since 2×313561999² = 196642254433752002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313561979) 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, 557659 + ... + 558220.

It is an arithmetic number, because the mean of its divisors is an integer number (78669540).

Almost surely, 2^313561999 is an apocalyptic number.

313561999 is a deficient number, since it is larger than the sum of its proper divisors (1116161).

313561999 is a wasteful number, since it uses less digits than its factorization.

313561999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116160.

The product of its digits is 196830, while the sum is 46.

The square root of 313561999 is about 17707.6819205677. The cubic root of 313561999 is about 679.3722573264.

The spelling of 313561999 in words is "three hundred thirteen million, five hundred sixty-one thousand, nine hundred ninety-nine".