18910451213 has 4 divisors (see below), whose sum is σ = 19732644768. Its totient is φ = 18088257660.

The previous prime is 18910451179. The next prime is 18910451239. The reversal of 18910451213 is 31215401981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18910451213 - 2¹⁶ = 18910385677 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 (18910451293) 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, 411096743 + ... + 411096788.

It is an arithmetic number, because the mean of its divisors is an integer number (4933161192).

Almost surely, 2^18910451213 is an apocalyptic number.

It is an amenable number.

18910451213 is a deficient number, since it is larger than the sum of its proper divisors (822193555).

18910451213 is an equidigital number, since it uses as much as digits as its factorization.

18910451213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822193554.

The product of its (nonzero) digits is 8640, while the sum is 35.

The spelling of 18910451213 in words is "eighteen billion, nine hundred ten million, four hundred fifty-one thousand, two hundred thirteen".