16155961 has 2 divisors, whose sum is σ = 16155962. Its totient is φ = 16155960.

The previous prime is 16155941. The next prime is 16155977. The reversal of 16155961 is 16955161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16152361 + 3600 = 4019^2 + 60^2 .

It is an emirp because it is prime and its reverse (16955161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16155961 - 2⁹ = 16155449 is a prime.

It is a super-2 number, since 2×16155961² = 522030151667042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16155901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8077980 + 8077981.

It is an arithmetic number, because the mean of its divisors is an integer number (8077981).

Almost surely, 2^16155961 is an apocalyptic number.

It is an amenable number.

16155961 is a deficient number, since it is larger than the sum of its proper divisors (1).

16155961 is an equidigital number, since it uses as much as digits as its factorization.

16155961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100, while the sum is 34.

The square root of 16155961 is about 4019.4478476527. The cubic root of 16155961 is about 252.8003079848.

The spelling of 16155961 in words is "sixteen million, one hundred fifty-five thousand, nine hundred sixty-one".