1813091069 has 2 divisors, whose sum is σ = 1813091070. Its totient is φ = 1813091068.

The previous prime is 1813091047. The next prime is 1813091101. The reversal of 1813091069 is 9601903181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1420536100 + 392554969 = 37690^2 + 19813^2 .

It is a cyclic number.

It is not a de Polignac number, because 1813091069 - 2⁸ = 1813090813 is a prime.

It is a super-2 number, since 2×1813091069² = 6574598448975125522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1813091029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906545534 + 906545535.

It is an arithmetic number, because the mean of its divisors is an integer number (906545535).

Almost surely, 2^1813091069 is an apocalyptic number.

It is an amenable number.

1813091069 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813091069 is an equidigital number, since it uses as much as digits as its factorization.

1813091069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 1813091069 is about 42580.4071023282. The cubic root of 1813091069 is about 1219.3822611697.

The spelling of 1813091069 in words is "one billion, eight hundred thirteen million, ninety-one thousand, sixty-nine".