18513213 has 8 divisors (see below), whose sum is σ = 24727008. Its totient is φ = 12320784.

The previous prime is 18513211. The next prime is 18513217. The reversal of 18513213 is 31231581.

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

It is not a de Polignac number, because 18513213 - 2¹ = 18513211 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18513211) 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, 3195 + ... + 6872.

It is an arithmetic number, because the mean of its divisors is an integer number (3090876).

Almost surely, 2^18513213 is an apocalyptic number.

It is an amenable number.

18513213 is a deficient number, since it is larger than the sum of its proper divisors (6213795).

18513213 is a wasteful number, since it uses less digits than its factorization.

18513213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10683.

The product of its digits is 720, while the sum is 24.

The square root of 18513213 is about 4302.6983394145. The cubic root of 18513213 is about 264.5415736244.

Adding to 18513213 its reverse (31231581), we get a palindrome (49744794).

The spelling of 18513213 in words is "eighteen million, five hundred thirteen thousand, two hundred thirteen".