15813055 has 4 divisors (see below), whose sum is σ = 18975672. Its totient is φ = 12650440.

The previous prime is 15813053. The next prime is 15813059. The reversal of 15813055 is 55031851.

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

It is not a de Polignac number, because 15813055 - 2¹ = 15813053 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 (15813053) 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, 1581301 + ... + 1581310.

It is an arithmetic number, because the mean of its divisors is an integer number (4743918).

Almost surely, 2^15813055 is an apocalyptic number.

15813055 is a deficient number, since it is larger than the sum of its proper divisors (3162617).

15813055 is an equidigital number, since it uses as much as digits as its factorization.

15813055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3162616.

The product of its (nonzero) digits is 3000, while the sum is 28.

The square root of 15813055 is about 3976.5632146365. The cubic root of 15813055 is about 250.9989629751.

Subtracting 15813055 from its reverse (55031851), we obtain a triangular number (39218796 = T₈₈₅₆).

The spelling of 15813055 in words is "fifteen million, eight hundred thirteen thousand, fifty-five".