15172081 has 2 divisors, whose sum is σ = 15172082. Its totient is φ = 15172080.

The previous prime is 15172067. The next prime is 15172093. The reversal of 15172081 is 18027151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13571856 + 1600225 = 3684^2 + 1265^2 .

It is a cyclic number.

It is not a de Polignac number, because 15172081 - 2⁷ = 15171953 is a prime.

It is a super-2 number, since 2×15172081² = 460384083741122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15172181) 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, 7586040 + 7586041.

It is an arithmetic number, because the mean of its divisors is an integer number (7586041).

Almost surely, 2^15172081 is an apocalyptic number.

15172081 is the 2464-th centered pentagonal number.

It is an amenable number.

15172081 is a deficient number, since it is larger than the sum of its proper divisors (1).

15172081 is an equidigital number, since it uses as much as digits as its factorization.

15172081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 15172081 is about 3895.1355560494. The cubic root of 15172081 is about 247.5607088433.

The spelling of 15172081 in words is "fifteen million, one hundred seventy-two thousand, eighty-one".