31663169 has 2 divisors, whose sum is σ = 31663170. Its totient is φ = 31663168.

The previous prime is 31663153. The next prime is 31663187. The reversal of 31663169 is 96136613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27615025 + 4048144 = 5255^2 + 2012^2 .

It is a cyclic number.

It is not a de Polignac number, because 31663169 - 2⁴ = 31663153 is a prime.

It is a super-2 number, since 2×31663169² = 2005112542245122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31663199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15831584 + 15831585.

It is an arithmetic number, because the mean of its divisors is an integer number (15831585).

Almost surely, 2^31663169 is an apocalyptic number.

It is an amenable number.

31663169 is a deficient number, since it is larger than the sum of its proper divisors (1).

31663169 is an equidigital number, since it uses as much as digits as its factorization.

31663169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 35.

The square root of 31663169 is about 5627.0035542907. The cubic root of 31663169 is about 316.3623500585.

The spelling of 31663169 in words is "thirty-one million, six hundred sixty-three thousand, one hundred sixty-nine".