31343031 has 20 divisors (see below), whose sum is σ = 47823072. Its totient is φ = 20448288.

The previous prime is 31343023. The next prime is 31343057. The reversal of 31343031 is 13034313.

It is not a de Polignac number, because 31343031 - 2³ = 31343023 is a prime.

It is a super-2 number, since 2×31343031² = 1964771184533922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31342995 and 31343013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31343131) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 310 + ... + 7923.

Almost surely, 2^31343031 is an apocalyptic number.

31343031 is a deficient number, since it is larger than the sum of its proper divisors (16480041).

31343031 is an equidigital number, since it uses as much as digits as its factorization.

31343031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8292 (or 8283 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 31343031 is about 5598.4847057039. The cubic root of 31343031 is about 315.2925173921.

Adding to 31343031 its reverse (13034313), we get a palindrome (44377344).

The spelling of 31343031 in words is "thirty-one million, three hundred forty-three thousand, thirty-one".