31290523447 has 2 divisors, whose sum is σ = 31290523448. Its totient is φ = 31290523446.

The previous prime is 31290523441. The next prime is 31290523469. The reversal of 31290523447 is 74432509213.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31290523447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31290523441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15645261723 + 15645261724.

It is an arithmetic number, because the mean of its divisors is an integer number (15645261724).

Almost surely, 2^31290523447 is an apocalyptic number.

31290523447 is a deficient number, since it is larger than the sum of its proper divisors (1).

31290523447 is an equidigital number, since it uses as much as digits as its factorization.

31290523447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 40.

The spelling of 31290523447 in words is "thirty-one billion, two hundred ninety million, five hundred twenty-three thousand, four hundred forty-seven".