31520745667 has 2 divisors, whose sum is σ = 31520745668. Its totient is φ = 31520745666.

The previous prime is 31520745637. The next prime is 31520745679. The reversal of 31520745667 is 76654702513.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31520745667 - 2⁷ = 31520745539 is a prime.

It is not a weakly prime, because it can be changed into another prime (31520745637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15760372833 + 15760372834.

It is an arithmetic number, because the mean of its divisors is an integer number (15760372834).

Almost surely, 2^31520745667 is an apocalyptic number.

31520745667 is a deficient number, since it is larger than the sum of its proper divisors (1).

31520745667 is an equidigital number, since it uses as much as digits as its factorization.

31520745667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1058400, while the sum is 46.

The spelling of 31520745667 in words is "thirty-one billion, five hundred twenty million, seven hundred forty-five thousand, six hundred sixty-seven".