15481891 has 8 divisors (see below), whose sum is σ = 15784704. Its totient is φ = 15181320.

The previous prime is 15481871. The next prime is 15481897. The reversal of 15481891 is 19818451.

15481891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15481891 - 2⁵ = 15481859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15481891.

It is not an unprimeable number, because it can be changed into a prime (15481897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20466 + ... + 21208.

It is an arithmetic number, because the mean of its divisors is an integer number (1973088).

Almost surely, 2^15481891 is an apocalyptic number.

15481891 is a deficient number, since it is larger than the sum of its proper divisors (302813).

15481891 is an equidigital number, since it uses as much as digits as its factorization.

15481891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121.

The product of its digits is 11520, while the sum is 37.

The square root of 15481891 is about 3934.7034195731. The cubic root of 15481891 is about 249.2344098803.

The spelling of 15481891 in words is "fifteen million, four hundred eighty-one thousand, eight hundred ninety-one".