313131109 has 4 divisors (see below), whose sum is σ = 331550604. Its totient is φ = 294711616.

The previous prime is 313131107. The next prime is 313131127. The reversal of 313131109 is 901131313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 901131313 = 281 ⋅3206873.

It can be written as a sum of positive squares in 2 ways, for example, as 206008609 + 107122500 = 14353^2 + 10350^2 .

It is a cyclic number.

It is not a de Polignac number, because 313131109 - 2¹ = 313131107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 313131109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313131107) 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, 9209722 + ... + 9209755.

It is an arithmetic number, because the mean of its divisors is an integer number (82887651).

Almost surely, 2^313131109 is an apocalyptic number.

It is an amenable number.

313131109 is a deficient number, since it is larger than the sum of its proper divisors (18419495).

313131109 is a wasteful number, since it uses less digits than its factorization.

313131109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18419494.

The product of its (nonzero) digits is 243, while the sum is 22.

The square root of 313131109 is about 17695.5109844277. The cubic root of 313131109 is about 679.0609218699.

The spelling of 313131109 in words is "three hundred thirteen million, one hundred thirty-one thousand, one hundred nine".