31319023 has 4 divisors (see below), whose sum is σ = 31760208. Its totient is φ = 30877840.

The previous prime is 31319017. The next prime is 31319033. The reversal of 31319023 is 32091313.

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

It is a cyclic number.

It is not a de Polignac number, because 31319023 - 2¹⁷ = 31187951 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31318985 and 31319003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31319033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220486 + ... + 220627.

It is an arithmetic number, because the mean of its divisors is an integer number (7940052).

Almost surely, 2^31319023 is an apocalyptic number.

31319023 is a deficient number, since it is larger than the sum of its proper divisors (441185).

31319023 is an equidigital number, since it uses as much as digits as its factorization.

31319023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441184.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 31319023 is about 5596.3401433437. The cubic root of 31319023 is about 315.2119946939.

The spelling of 31319023 in words is "thirty-one million, three hundred nineteen thousand, twenty-three".