16115917 has 2 divisors, whose sum is σ = 16115918. Its totient is φ = 16115916.

The previous prime is 16115887. The next prime is 16115941. The reversal of 16115917 is 71951161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16112196 + 3721 = 4014^2 + 61^2 .

It is an emirp because it is prime and its reverse (71951161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16115917 - 2²³ = 7727309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16115717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8057958 + 8057959.

It is an arithmetic number, because the mean of its divisors is an integer number (8057959).

Almost surely, 2^16115917 is an apocalyptic number.

It is an amenable number.

16115917 is a deficient number, since it is larger than the sum of its proper divisors (1).

16115917 is an equidigital number, since it uses as much as digits as its factorization.

16115917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1890, while the sum is 31.

The square root of 16115917 is about 4014.4634759828. The cubic root of 16115917 is about 252.5912724309.

The spelling of 16115917 in words is "sixteen million, one hundred fifteen thousand, nine hundred seventeen".