15561055 has 16 divisors (see below), whose sum is σ = 19270944. Its totient is φ = 12055680.

The previous prime is 15561047. The next prime is 15561059. The reversal of 15561055 is 55016551.

It is not a de Polignac number, because 15561055 - 2³ = 15561047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15561059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33525 + ... + 33985.

It is an arithmetic number, because the mean of its divisors is an integer number (1204434).

Almost surely, 2^15561055 is an apocalyptic number.

15561055 is a deficient number, since it is larger than the sum of its proper divisors (3709889).

15561055 is a wasteful number, since it uses less digits than its factorization.

15561055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 15561055 is about 3944.7503089549. The cubic root of 15561055 is about 249.6584937062.

The spelling of 15561055 in words is "fifteen million, five hundred sixty-one thousand, fifty-five".