31314331 has 2 divisors, whose sum is σ = 31314332. Its totient is φ = 31314330.

The previous prime is 31314319. The next prime is 31314373. The reversal of 31314331 is 13341313.

It is a weak prime.

It is an emirp because it is prime and its reverse (13341313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31314331 - 2⁹ = 31313819 is a prime.

It is a super-2 number, since 2×31314331² = 1961174651955122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31314299 and 31314308.

It is not a weakly prime, because it can be changed into another prime (31314131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15657165 + 15657166.

It is an arithmetic number, because the mean of its divisors is an integer number (15657166).

Almost surely, 2^31314331 is an apocalyptic number.

31314331 is a deficient number, since it is larger than the sum of its proper divisors (1).

31314331 is an equidigital number, since it uses as much as digits as its factorization.

31314331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 19.

The square root of 31314331 is about 5595.9209251025. The cubic root of 31314331 is about 315.1962529455.

Adding to 31314331 its reverse (13341313), we get a palindrome (44655644).

The spelling of 31314331 in words is "thirty-one million, three hundred fourteen thousand, three hundred thirty-one".