1318198919 has 2 divisors, whose sum is σ = 1318198920. Its totient is φ = 1318198918.

The previous prime is 1318198877. The next prime is 1318198933. The reversal of 1318198919 is 9198918131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1318198919 - 2²⁰ = 1317150343 is a prime.

It is a super-2 number, since 2×1318198919² = 3475296780105537122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1318198939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659099459 + 659099460.

It is an arithmetic number, because the mean of its divisors is an integer number (659099460).

Almost surely, 2^1318198919 is an apocalyptic number.

1318198919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1318198919 is an equidigital number, since it uses as much as digits as its factorization.

1318198919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 50.

The square root of 1318198919 is about 36307.0092268697. The cubic root of 1318198919 is about 1096.4621651714.

The spelling of 1318198919 in words is "one billion, three hundred eighteen million, one hundred ninety-eight thousand, nine hundred nineteen".