31314397 has 2 divisors, whose sum is σ = 31314398. Its totient is φ = 31314396.

The previous prime is 31314373. The next prime is 31314407. The reversal of 31314397 is 79341313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16112196 + 15202201 = 4014^2 + 3899^2 .

It is a cyclic number.

It is not a de Polignac number, because 31314397 - 2²³ = 22925789 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31314317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15657198 + 15657199.

It is an arithmetic number, because the mean of its divisors is an integer number (15657199).

Almost surely, 2^31314397 is an apocalyptic number.

It is an amenable number.

31314397 is a deficient number, since it is larger than the sum of its proper divisors (1).

31314397 is an equidigital number, since it uses as much as digits as its factorization.

31314397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 31.

The square root of 31314397 is about 5595.9268222521. The cubic root of 31314397 is about 315.1964743877.

The spelling of 31314397 in words is "thirty-one million, three hundred fourteen thousand, three hundred ninety-seven".