15561051 has 16 divisors (see below), whose sum is σ = 22740480. Its totient is φ = 9386720.

The previous prime is 15561047. The next prime is 15561059. The reversal of 15561051 is 15016551.

It is a cyclic number.

It is not a de Polignac number, because 15561051 - 2² = 15561047 is a prime.

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, 6901 + ... + 8873.

It is an arithmetic number, because the mean of its divisors is an integer number (1421280).

Almost surely, 2^15561051 is an apocalyptic number.

15561051 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

15561051 is a deficient number, since it is larger than the sum of its proper divisors (7179429).

15561051 is a wasteful number, since it uses less digits than its factorization.

15561051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2226.

The product of its (nonzero) digits is 750, while the sum is 24.

The square root of 15561051 is about 3944.7498019520. The cubic root of 15561051 is about 249.6584723145.

The spelling of 15561051 in words is "fifteen million, five hundred sixty-one thousand, fifty-one".