16631161 has 2 divisors, whose sum is σ = 16631162. Its totient is φ = 16631160.

The previous prime is 16631119. The next prime is 16631179. The reversal of 16631161 is 16113661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11943936 + 4687225 = 3456^2 + 2165^2 .

It is a cyclic number.

It is not a de Polignac number, because 16631161 - 2⁷ = 16631033 is a prime.

It is not a weakly prime, because it can be changed into another prime (16631191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8315580 + 8315581.

It is an arithmetic number, because the mean of its divisors is an integer number (8315581).

Almost surely, 2^16631161 is an apocalyptic number.

It is an amenable number.

16631161 is a deficient number, since it is larger than the sum of its proper divisors (1).

16631161 is an equidigital number, since it uses as much as digits as its factorization.

16631161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 25.

The square root of 16631161 is about 4078.1320478866. The cubic root of 16631161 is about 255.2549596567.

The spelling of 16631161 in words is "sixteen million, six hundred thirty-one thousand, one hundred sixty-one".