15712561 has 2 divisors, whose sum is σ = 15712562. Its totient is φ = 15712560.

The previous prime is 15712549. The next prime is 15712579. The reversal of 15712561 is 16521751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13838400 + 1874161 = 3720^2 + 1369^2 .

It is a cyclic number.

It is not a de Polignac number, because 15712561 - 2⁹ = 15712049 is a prime.

It is not a weakly prime, because it can be changed into another prime (15712511) 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, 7856280 + 7856281.

It is an arithmetic number, because the mean of its divisors is an integer number (7856281).

Almost surely, 2^15712561 is an apocalyptic number.

It is an amenable number.

15712561 is a deficient number, since it is larger than the sum of its proper divisors (1).

15712561 is an equidigital number, since it uses as much as digits as its factorization.

15712561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2100, while the sum is 28.

The square root of 15712561 is about 3963.9072895314. The cubic root of 15712561 is about 250.4661223796.

The spelling of 15712561 in words is "fifteen million, seven hundred twelve thousand, five hundred sixty-one".