15605281 has 2 divisors, whose sum is σ = 15605282. Its totient is φ = 15605280.

The previous prime is 15605279. The next prime is 15605287. The reversal of 15605281 is 18250651.

15605281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8503056 + 7102225 = 2916^2 + 2665^2 .

It is a cyclic number.

It is not a de Polignac number, because 15605281 - 2¹ = 15605279 is a prime.

It is a super-2 number, since 2×15605281² = 487049590177922, which contains 22 as substring.

Together with 15605279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (15605287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7802640 + 7802641.

It is an arithmetic number, because the mean of its divisors is an integer number (7802641).

Almost surely, 2^15605281 is an apocalyptic number.

It is an amenable number.

15605281 is a deficient number, since it is larger than the sum of its proper divisors (1).

15605281 is an equidigital number, since it uses as much as digits as its factorization.

15605281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 15605281 is about 3950.3520096315. The cubic root of 15605281 is about 249.8947877277.

The spelling of 15605281 in words is "fifteen million, six hundred five thousand, two hundred eighty-one".