15055591 has 4 divisors (see below), whose sum is σ = 15941232. Its totient is φ = 14169952.

The previous prime is 15055577. The next prime is 15055603. The reversal of 15055591 is 19555051.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 15055591 - 2¹³ = 15047399 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 (15055531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442795 + ... + 442828.

It is an arithmetic number, because the mean of its divisors is an integer number (3985308).

Almost surely, 2^15055591 is an apocalyptic number.

15055591 is a deficient number, since it is larger than the sum of its proper divisors (885641).

15055591 is an equidigital number, since it uses as much as digits as its factorization.

15055591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885640.

The product of its (nonzero) digits is 5625, while the sum is 31.

The square root of 15055591 is about 3880.1534763460. The cubic root of 15055591 is about 246.9254967153.

The spelling of 15055591 in words is "fifteen million, fifty-five thousand, five hundred ninety-one".