31225604161 has 2 divisors, whose sum is σ = 31225604162. Its totient is φ = 31225604160.

The previous prime is 31225604153. The next prime is 31225604183. The reversal of 31225604161 is 16140652213.

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., 29372818225 + 1852785936 = 171385^2 + 43044^2 .

It is a cyclic number.

It is not a de Polignac number, because 31225604161 - 2³ = 31225604153 is a prime.

It is not a weakly prime, because it can be changed into another prime (31225604261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15612802080 + 15612802081.

It is an arithmetic number, because the mean of its divisors is an integer number (15612802081).

Almost surely, 2^31225604161 is an apocalyptic number.

It is an amenable number.

31225604161 is a deficient number, since it is larger than the sum of its proper divisors (1).

31225604161 is an equidigital number, since it uses as much as digits as its factorization.

31225604161 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 31225604161 in words is "thirty-one billion, two hundred twenty-five million, six hundred four thousand, one hundred sixty-one".