1813692689 has 2 divisors, whose sum is σ = 1813692690. Its totient is φ = 1813692688.

The previous prime is 1813692659. The next prime is 1813692691. The reversal of 1813692689 is 9862963181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1027843600 + 785849089 = 32060^2 + 28033^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1813692689 is a prime.

Together with 1813692691, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1813692689.

It is not a weakly prime, because it can be changed into another prime (1813692649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906846344 + 906846345.

It is an arithmetic number, because the mean of its divisors is an integer number (906846345).

Almost surely, 2^1813692689 is an apocalyptic number.

It is an amenable number.

1813692689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813692689 is an equidigital number, since it uses as much as digits as its factorization.

1813692689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 53.

The square root of 1813692689 is about 42587.4710331572. The cubic root of 1813692689 is about 1219.5171180893.

The spelling of 1813692689 in words is "one billion, eight hundred thirteen million, six hundred ninety-two thousand, six hundred eighty-nine".