31300020397 has 2 divisors, whose sum is σ = 31300020398. Its totient is φ = 31300020396.

The previous prime is 31300020277. The next prime is 31300020467. The reversal of 31300020397 is 79302000313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25736501476 + 5563518921 = 160426^2 + 74589^2 .

It is a cyclic number.

It is not a de Polignac number, because 31300020397 - 2²⁷ = 31165802669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31300020797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15650010198 + 15650010199.

It is an arithmetic number, because the mean of its divisors is an integer number (15650010199).

Almost surely, 2^31300020397 is an apocalyptic number.

It is an amenable number.

31300020397 is a deficient number, since it is larger than the sum of its proper divisors (1).

31300020397 is an equidigital number, since it uses as much as digits as its factorization.

31300020397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 28.

The spelling of 31300020397 in words is "thirty-one billion, three hundred million, twenty thousand, three hundred ninety-seven".