31142402509 has 2 divisors, whose sum is σ = 31142402510. Its totient is φ = 31142402508.

The previous prime is 31142402483. The next prime is 31142402563. The reversal of 31142402509 is 90520424113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21468696484 + 9673706025 = 146522^2 + 98355^2 .

It is a cyclic number.

It is not a de Polignac number, because 31142402509 - 2¹¹ = 31142400461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31142402209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15571201254 + 15571201255.

It is an arithmetic number, because the mean of its divisors is an integer number (15571201255).

Almost surely, 2^31142402509 is an apocalyptic number.

It is an amenable number.

31142402509 is a deficient number, since it is larger than the sum of its proper divisors (1).

31142402509 is an equidigital number, since it uses as much as digits as its factorization.

31142402509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 31142402509 in words is "thirty-one billion, one hundred forty-two million, four hundred two thousand, five hundred nine".