31140497 has 2 divisors, whose sum is σ = 31140498. Its totient is φ = 31140496.

The previous prime is 31140493. The next prime is 31140503. The reversal of 31140497 is 79404113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31013761 + 126736 = 5569^2 + 356^2 .

It is a cyclic number.

It is not a de Polignac number, because 31140497 - 2² = 31140493 is a prime.

It is not a weakly prime, because it can be changed into another prime (31140493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15570248 + 15570249.

It is an arithmetic number, because the mean of its divisors is an integer number (15570249).

Almost surely, 2^31140497 is an apocalyptic number.

It is an amenable number.

31140497 is a deficient number, since it is larger than the sum of its proper divisors (1).

31140497 is an equidigital number, since it uses as much as digits as its factorization.

31140497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 31140497 is about 5580.3671026197. The cubic root of 31140497 is about 314.6119248821.

The spelling of 31140497 in words is "thirty-one million, one hundred forty thousand, four hundred ninety-seven".