1800136697 has 2 divisors, whose sum is σ = 1800136698. Its totient is φ = 1800136696.

The previous prime is 1800136673. The next prime is 1800136753. The reversal of 1800136697 is 7966310081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1041740176 + 758396521 = 32276^2 + 27539^2 .

It is an emirp because it is prime and its reverse (7966310081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1800136697 - 2⁸ = 1800136441 is a prime.

It is not a weakly prime, because it can be changed into another prime (1800136097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900068348 + 900068349.

It is an arithmetic number, because the mean of its divisors is an integer number (900068349).

Almost surely, 2^1800136697 is an apocalyptic number.

It is an amenable number.

1800136697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1800136697 is an equidigital number, since it uses as much as digits as its factorization.

1800136697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 1800136697 is about 42428.0178302027. The cubic root of 1800136697 is about 1216.4711916228.

The spelling of 1800136697 in words is "one billion, eight hundred million, one hundred thirty-six thousand, six hundred ninety-seven".