1813139 has 2 divisors, whose sum is σ = 1813140. Its totient is φ = 1813138.

The previous prime is 1813121. The next prime is 1813157. The reversal of 1813139 is 9313181.

It is a balanced prime because it is at equal distance from previous prime (1813121) and next prime (1813157).

It is a cyclic number.

It is not a de Polignac number, because 1813139 - 2²⁰ = 764563 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1813039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906569 + 906570.

It is an arithmetic number, because the mean of its divisors is an integer number (906570).

2^1813139 is an apocalyptic number.

1813139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813139 is an equidigital number, since it uses as much as digits as its factorization.

1813139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 26.

The square root of 1813139 is about 1346.5284995127. The cubic root of 1813139 is about 121.9393006299.

The spelling of 1813139 in words is "one million, eight hundred thirteen thousand, one hundred thirty-nine".