1813105109 has 2 divisors, whose sum is σ = 1813105110. Its totient is φ = 1813105108.

The previous prime is 1813105103. The next prime is 1813105181. The reversal of 1813105109 is 9015013181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1149888100 + 663217009 = 33910^2 + 25753^2 .

It is a cyclic number.

It is not a de Polignac number, because 1813105109 - 2⁴ = 1813105093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1813105103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906552554 + 906552555.

It is an arithmetic number, because the mean of its divisors is an integer number (906552555).

Almost surely, 2^1813105109 is an apocalyptic number.

It is an amenable number.

1813105109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813105109 is an equidigital number, since it uses as much as digits as its factorization.

1813105109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 29.

The square root of 1813105109 is about 42580.5719665671. The cubic root of 1813105109 is about 1219.3854086643.

The spelling of 1813105109 in words is "one billion, eight hundred thirteen million, one hundred five thousand, one hundred nine".