31294590517 has 2 divisors, whose sum is σ = 31294590518. Its totient is φ = 31294590516.

The previous prime is 31294590499. The next prime is 31294590581. The reversal of 31294590517 is 71509549213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27182446641 + 4112143876 = 164871^2 + 64126^2 .

It is an emirp because it is prime and its reverse (71509549213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31294590517 - 2¹¹ = 31294588469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31294590317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15647295258 + 15647295259.

It is an arithmetic number, because the mean of its divisors is an integer number (15647295259).

Almost surely, 2^31294590517 is an apocalyptic number.

It is an amenable number.

31294590517 is a deficient number, since it is larger than the sum of its proper divisors (1).

31294590517 is an equidigital number, since it uses as much as digits as its factorization.

31294590517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 340200, while the sum is 46.

The spelling of 31294590517 in words is "thirty-one billion, two hundred ninety-four million, five hundred ninety thousand, five hundred seventeen".