1919133218 has 4 divisors (see below), whose sum is σ = 2878699830. Its totient is φ = 959566608.

The previous prime is 1919133191. The next prime is 1919133241. The reversal of 1919133218 is 8123319191.

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

It can be written as a sum of positive squares in only one way, i.e., 1723329169 + 195804049 = 41513^2 + 13993^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 479783303 + ... + 479783306.

Almost surely, 2^1919133218 is an apocalyptic number.

1919133218 is a deficient number, since it is larger than the sum of its proper divisors (959566612).

1919133218 is an equidigital number, since it uses as much as digits as its factorization.

1919133218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959566611.

The product of its digits is 11664, while the sum is 38.

The square root of 1919133218 is about 43807.9127327473. The cubic root of 1919133218 is about 1242.7059399786.

The spelling of 1919133218 in words is "one billion, nine hundred nineteen million, one hundred thirty-three thousand, two hundred eighteen".