1918918143 has 6 divisors (see below), whose sum is σ = 2771770664. Its totient is φ = 1279278756.

The previous prime is 1918918109. The next prime is 1918918147. The reversal of 1918918143 is 3418198191.

It is a happy number.

It is not a de Polignac number, because 1918918143 - 2⁹ = 1918917631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918918147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106606555 + ... + 106606572.

Almost surely, 2^1918918143 is an apocalyptic number.

1918918143 is a deficient number, since it is larger than the sum of its proper divisors (852852521).

1918918143 is a wasteful number, since it uses less digits than its factorization.

1918918143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213213133 (or 213213130 counting only the distinct ones).

The product of its digits is 62208, while the sum is 45.

The square root of 1918918143 is about 43805.4579133697. The cubic root of 1918918143 is about 1242.6595153805.

The spelling of 1918918143 in words is "one billion, nine hundred eighteen million, nine hundred eighteen thousand, one hundred forty-three".