31313869 has 4 divisors (see below), whose sum is σ = 31338144. Its totient is φ = 31289596.

The previous prime is 31313851. The next prime is 31313899. The reversal of 31313869 is 96831313.

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, and also an emirpimes, since its reverse is a distinct semiprime: 96831313 = 43 ⋅2251891.

It is a cyclic number.

It is not a de Polignac number, because 31313869 - 2¹¹ = 31311821 is a prime.

It is a super-2 number, since 2×31313869² = 1961116783498322, 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 (31313809) 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, 10087 + ... + 12820.

It is an arithmetic number, because the mean of its divisors is an integer number (7834536).

Almost surely, 2^31313869 is an apocalyptic number.

It is an amenable number.

31313869 is a deficient number, since it is larger than the sum of its proper divisors (24275).

31313869 is a wasteful number, since it uses less digits than its factorization.

31313869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24274.

The product of its digits is 11664, while the sum is 34.

The square root of 31313869 is about 5595.8796448816. The cubic root of 31313869 is about 315.1947028418.

The spelling of 31313869 in words is "thirty-one million, three hundred thirteen thousand, eight hundred sixty-nine".