31522640161 has 2 divisors, whose sum is σ = 31522640162. Its totient is φ = 31522640160.

The previous prime is 31522640153. The next prime is 31522640243. The reversal of 31522640161 is 16104622513.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21710549025 + 9812091136 = 147345^2 + 99056^2 .

It is a cyclic number.

It is not a de Polignac number, because 31522640161 - 2³ = 31522640153 is a prime.

It is not a weakly prime, because it can be changed into another prime (31522640101) 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, 15761320080 + 15761320081.

It is an arithmetic number, because the mean of its divisors is an integer number (15761320081).

Almost surely, 2^31522640161 is an apocalyptic number.

It is an amenable number.

31522640161 is a deficient number, since it is larger than the sum of its proper divisors (1).

31522640161 is an equidigital number, since it uses as much as digits as its factorization.

31522640161 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 31522640161 in words is "thirty-one billion, five hundred twenty-two million, six hundred forty thousand, one hundred sixty-one".