1918519 has 2 divisors, whose sum is σ = 1918520. Its totient is φ = 1918518.

The previous prime is 1918517. The next prime is 1918523. The reversal of 1918519 is 9158191.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1918519 - 2¹ = 1918517 is a prime.

It is a super-2 number, since 2×1918519² = 7361430306722, which contains 22 as substring.

Together with 1918517, it forms a pair of twin primes.

It is an Ulam number.

1918519 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1918517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959259 + 959260.

It is an arithmetic number, because the mean of its divisors is an integer number (959260).

2^1918519 is an apocalyptic number.

1918519 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918519 is an equidigital number, since it uses as much as digits as its factorization.

1918519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 34.

The square root of 1918519 is about 1385.1061331176. The cubic root of 1918519 is about 124.2573349947.

The spelling of 1918519 in words is "one million, nine hundred eighteen thousand, five hundred nineteen".