18513913 has 8 divisors (see below), whose sum is σ = 20848896. Its totient is φ = 16287600.

The previous prime is 18513883. The next prime is 18513917. The reversal of 18513913 is 31931581.

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 18513913 - 2⁵ = 18513881 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18513917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26806 + ... + 27487.

It is an arithmetic number, because the mean of its divisors is an integer number (2606112).

Almost surely, 2^18513913 is an apocalyptic number.

It is an amenable number.

18513913 is a deficient number, since it is larger than the sum of its proper divisors (2334983).

18513913 is a wasteful number, since it uses less digits than its factorization.

18513913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54335.

The product of its digits is 3240, while the sum is 31.

The square root of 18513913 is about 4302.7796829492. The cubic root of 18513913 is about 264.5449077614.

The spelling of 18513913 in words is "eighteen million, five hundred thirteen thousand, nine hundred thirteen".