15145561 has 2 divisors, whose sum is σ = 15145562. Its totient is φ = 15145560.

The previous prime is 15145549. The next prime is 15145573. The reversal of 15145561 is 16554151.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (15145549) and next prime (15145573).

It can be written as a sum of positive squares in only one way, i.e., 14969161 + 176400 = 3869^2 + 420^2 .

It is an emirp because it is prime and its reverse (16554151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15145561 - 2⁷ = 15145433 is a prime.

It is not a weakly prime, because it can be changed into another prime (15145531) 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, 7572780 + 7572781.

It is an arithmetic number, because the mean of its divisors is an integer number (7572781).

Almost surely, 2^15145561 is an apocalyptic number.

It is an amenable number.

15145561 is a deficient number, since it is larger than the sum of its proper divisors (1).

15145561 is an equidigital number, since it uses as much as digits as its factorization.

15145561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3000, while the sum is 28.

The square root of 15145561 is about 3891.7298210436. The cubic root of 15145561 is about 247.4163836847.

The spelling of 15145561 in words is "fifteen million, one hundred forty-five thousand, five hundred sixty-one".