1918373819 has 2 divisors, whose sum is σ = 1918373820. Its totient is φ = 1918373818.

The previous prime is 1918373813. The next prime is 1918373833. The reversal of 1918373819 is 9183738191.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1918373819 - 2⁴ = 1918373803 is a prime.

It is a super-2 number, since 2×1918373819² = 7360316218849289522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1918373813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959186909 + 959186910.

It is an arithmetic number, because the mean of its divisors is an integer number (959186910).

Almost surely, 2^1918373819 is an apocalyptic number.

1918373819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918373819 is an equidigital number, since it uses as much as digits as its factorization.

1918373819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 50.

The square root of 1918373819 is about 43799.2445026167. The cubic root of 1918373819 is about 1242.5420058751.

The spelling of 1918373819 in words is "one billion, nine hundred eighteen million, three hundred seventy-three thousand, eight hundred nineteen".