31300397 has 2 divisors, whose sum is σ = 31300398. Its totient is φ = 31300396.

The previous prime is 31300327. The next prime is 31300403. The reversal of 31300397 is 79300313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26894596 + 4405801 = 5186^2 + 2099^2 .

It is a cyclic number.

It is not a de Polignac number, because 31300397 - 2⁸ = 31300141 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 (31300307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15650198 + 15650199.

It is an arithmetic number, because the mean of its divisors is an integer number (15650199).

Almost surely, 2^31300397 is an apocalyptic number.

It is an amenable number.

31300397 is a deficient number, since it is larger than the sum of its proper divisors (1).

31300397 is an equidigital number, since it uses as much as digits as its factorization.

31300397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1701, while the sum is 26.

The square root of 31300397 is about 5594.6757725538. The cubic root of 31300397 is about 315.1494948421.

The spelling of 31300397 in words is "thirty-one million, three hundred thousand, three hundred ninety-seven".