15481913 has 4 divisors (see below), whose sum is σ = 15694068. Its totient is φ = 15269760.

The previous prime is 15481901. The next prime is 15481933. The reversal of 15481913 is 31918451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31918451 = 647 ⋅49333.

It can be written as a sum of positive squares in 2 ways, for example, as 2999824 + 12482089 = 1732^2 + 3533^2 .

It is a cyclic number.

It is not a de Polignac number, because 15481913 - 2⁴ = 15481897 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 15481913.

It is not an unprimeable number, because it can be changed into a prime (15481933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105968 + ... + 106113.

It is an arithmetic number, because the mean of its divisors is an integer number (3923517).

Almost surely, 2^15481913 is an apocalyptic number.

It is an amenable number.

15481913 is a deficient number, since it is larger than the sum of its proper divisors (212155).

15481913 is an equidigital number, since it uses as much as digits as its factorization.

15481913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212154.

The product of its digits is 4320, while the sum is 32.

The square root of 15481913 is about 3934.7062152084. The cubic root of 15481913 is about 249.2345279355.

The spelling of 15481913 in words is "fifteen million, four hundred eighty-one thousand, nine hundred thirteen".