18970851 has 4 divisors (see below), whose sum is σ = 25294472. Its totient is φ = 12647232.

The previous prime is 18970841. The next prime is 18970867. The reversal of 18970851 is 15807981.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18970851 - 2¹⁵ = 18938083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18970811) 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, 3161806 + ... + 3161811.

It is an arithmetic number, because the mean of its divisors is an integer number (6323618).

Almost surely, 2^18970851 is an apocalyptic number.

18970851 is a deficient number, since it is larger than the sum of its proper divisors (6323621).

18970851 is an equidigital number, since it uses as much as digits as its factorization.

18970851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6323620.

The product of its (nonzero) digits is 20160, while the sum is 39.

The square root of 18970851 is about 4355.5540405326. The cubic root of 18970851 is about 266.7036367146.

The spelling of 18970851 in words is "eighteen million, nine hundred seventy thousand, eight hundred fifty-one".