15161681 has 2 divisors, whose sum is σ = 15161682. Its totient is φ = 15161680.

The previous prime is 15161659. The next prime is 15161689. The reversal of 15161681 is 18616151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9709456 + 5452225 = 3116^2 + 2335^2 .

It is a cyclic number.

It is not a de Polignac number, because 15161681 - 2⁶ = 15161617 is a prime.

It is a super-2 number, since 2×15161681² = 459753141491522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15161689) 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, 7580840 + 7580841.

It is an arithmetic number, because the mean of its divisors is an integer number (7580841).

Almost surely, 2^15161681 is an apocalyptic number.

It is an amenable number.

15161681 is a deficient number, since it is larger than the sum of its proper divisors (1).

15161681 is an equidigital number, since it uses as much as digits as its factorization.

15161681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 29.

The square root of 15161681 is about 3893.8003287277. The cubic root of 15161681 is about 247.5041308021.

The spelling of 15161681 in words is "fifteen million, one hundred sixty-one thousand, six hundred eighty-one".