16159921 has 2 divisors, whose sum is σ = 16159922. Its totient is φ = 16159920.

The previous prime is 16159901. The next prime is 16159939. The reversal of 16159921 is 12995161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10471696 + 5688225 = 3236^2 + 2385^2 .

It is a cyclic number.

It is not a de Polignac number, because 16159921 - 2¹¹ = 16157873 is a prime.

It is a super-2 number, since 2×16159921² = 522286093452482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16159901) 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, 8079960 + 8079961.

It is an arithmetic number, because the mean of its divisors is an integer number (8079961).

Almost surely, 2^16159921 is an apocalyptic number.

It is an amenable number.

16159921 is a deficient number, since it is larger than the sum of its proper divisors (1).

16159921 is an equidigital number, since it uses as much as digits as its factorization.

16159921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 34.

The square root of 16159921 is about 4019.9404224441. The cubic root of 16159921 is about 252.8209609900.

The spelling of 16159921 in words is "sixteen million, one hundred fifty-nine thousand, nine hundred twenty-one".