31540452397 has 2 divisors, whose sum is σ = 31540452398. Its totient is φ = 31540452396.

The previous prime is 31540452367. The next prime is 31540452431. The reversal of 31540452397 is 79325404513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20589667081 + 10950785316 = 143491^2 + 104646^2 .

It is a cyclic number.

It is not a de Polignac number, because 31540452397 - 2¹⁹ = 31539928109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31540452337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15770226198 + 15770226199.

It is an arithmetic number, because the mean of its divisors is an integer number (15770226199).

Almost surely, 2^31540452397 is an apocalyptic number.

It is an amenable number.

31540452397 is a deficient number, since it is larger than the sum of its proper divisors (1).

31540452397 is an equidigital number, since it uses as much as digits as its factorization.

31540452397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 43.

The spelling of 31540452397 in words is "thirty-one billion, five hundred forty million, four hundred fifty-two thousand, three hundred ninety-seven".