31075397 has 2 divisors, whose sum is σ = 31075398. Its totient is φ = 31075396.

The previous prime is 31075367. The next prime is 31075403. The reversal of 31075397 is 79357013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30625156 + 450241 = 5534^2 + 671^2 .

It is a cyclic number.

It is not a de Polignac number, because 31075397 - 2⁶ = 31075333 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 (31075307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15537698 + 15537699.

It is an arithmetic number, because the mean of its divisors is an integer number (15537699).

Almost surely, 2^31075397 is an apocalyptic number.

It is an amenable number.

31075397 is a deficient number, since it is larger than the sum of its proper divisors (1).

31075397 is an equidigital number, since it uses as much as digits as its factorization.

31075397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19845, while the sum is 35.

The square root of 31075397 is about 5574.5311013573. The cubic root of 31075397 is about 314.3925371923.

The spelling of 31075397 in words is "thirty-one million, seventy-five thousand, three hundred ninety-seven".