15560991 has 12 divisors (see below), whose sum is σ = 23309832. Its totient is φ = 10373832.

The previous prime is 15560989. The next prime is 15561037. The reversal of 15560991 is 19906551.

15560991 is a `hidden beast` number, since 1 + 5 + 560 + 9 + 91 = 666.

It is not a de Polignac number, because 15560991 - 2¹ = 15560989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15560971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31776 + ... + 32261.

It is an arithmetic number, because the mean of its divisors is an integer number (1942486).

Almost surely, 2^15560991 is an apocalyptic number.

15560991 is a deficient number, since it is larger than the sum of its proper divisors (7748841).

15560991 is an frugal number, since it uses more digits than its factorization.

15560991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64052 (or 64040 counting only the distinct ones).

The product of its (nonzero) digits is 12150, while the sum is 36.

The square root of 15560991 is about 3944.7421968996. The cubic root of 15560991 is about 249.6581514380.

The spelling of 15560991 in words is "fifteen million, five hundred sixty thousand, nine hundred ninety-one".