1818491839 has 2 divisors, whose sum is σ = 1818491840. Its totient is φ = 1818491838.

The previous prime is 1818491821. The next prime is 1818491863. The reversal of 1818491839 is 9381948181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1818491839 - 2²³ = 1810103231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1818491879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909245919 + 909245920.

It is an arithmetic number, because the mean of its divisors is an integer number (909245920).

Almost surely, 2^1818491839 is an apocalyptic number.

1818491839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818491839 is an equidigital number, since it uses as much as digits as its factorization.

1818491839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 52.

The square root of 1818491839 is about 42643.7784324982. The cubic root of 1818491839 is about 1220.5918115451.

The spelling of 1818491839 in words is "one billion, eight hundred eighteen million, four hundred ninety-one thousand, eight hundred thirty-nine".