1813948139 has 2 divisors, whose sum is σ = 1813948140. Its totient is φ = 1813948138.

The previous prime is 1813948133. The next prime is 1813948181. The reversal of 1813948139 is 9318493181.

It is a weak prime.

It is an emirp because it is prime and its reverse (9318493181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1813948139 - 2²⁰ = 1812899563 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1813948093 and 1813948102.

It is not a weakly prime, because it can be changed into another prime (1813948133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906974069 + 906974070.

It is an arithmetic number, because the mean of its divisors is an integer number (906974070).

Almost surely, 2^1813948139 is an apocalyptic number.

1813948139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813948139 is an equidigital number, since it uses as much as digits as its factorization.

1813948139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 47.

The square root of 1813948139 is about 42590.4700490614. The cubic root of 1813948139 is about 1219.5743697992.

The spelling of 1813948139 in words is "one billion, eight hundred thirteen million, nine hundred forty-eight thousand, one hundred thirty-nine".