31339697 has 2 divisors, whose sum is σ = 31339698. Its totient is φ = 31339696.

The previous prime is 31339681. The next prime is 31339699. The reversal of 31339697 is 79693313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26946481 + 4393216 = 5191^2 + 2096^2 .

It is a cyclic number.

It is not a de Polignac number, because 31339697 - 2⁴ = 31339681 is a prime.

Together with 31339699, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31339699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15669848 + 15669849.

It is an arithmetic number, because the mean of its divisors is an integer number (15669849).

Almost surely, 2^31339697 is an apocalyptic number.

It is an amenable number.

31339697 is a deficient number, since it is larger than the sum of its proper divisors (1).

31339697 is an equidigital number, since it uses as much as digits as its factorization.

31339697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91854, while the sum is 41.

The square root of 31339697 is about 5598.1869386436. The cubic root of 31339697 is about 315.2813376339.

The spelling of 31339697 in words is "thirty-one million, three hundred thirty-nine thousand, six hundred ninety-seven".