15495561 has 6 divisors (see below), whose sum is σ = 22382490. Its totient is φ = 10330368.

The previous prime is 15495547. The next prime is 15495569. The reversal of 15495561 is 16559451.

15495561 is a `hidden beast` number, since 1 + 5 + 4 + 95 + 561 = 666.

15495561 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 12467961 + 3027600 = 3531^2 + 1740^2 .

It is not a de Polignac number, because 15495561 - 2⁷ = 15495433 is a prime.

It is a super-2 number, since 2×15495561² = 480224821409442, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15495569) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 860856 + ... + 860873.

It is an arithmetic number, because the mean of its divisors is an integer number (3730415).

Almost surely, 2^15495561 is an apocalyptic number.

It is an amenable number.

15495561 is a deficient number, since it is larger than the sum of its proper divisors (6886929).

15495561 is a wasteful number, since it uses less digits than its factorization.

15495561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721735 (or 1721732 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 15495561 is about 3936.4401430734. The cubic root of 15495561 is about 249.3077435600.

The spelling of 15495561 in words is "fifteen million, four hundred ninety-five thousand, five hundred sixty-one".