1801653809 has 2 divisors, whose sum is σ = 1801653810. Its totient is φ = 1801653808.

The previous prime is 1801653803. The next prime is 1801653811. The reversal of 1801653809 is 9083561081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1407750400 + 393903409 = 37520^2 + 19847^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1801653809 is a prime.

Together with 1801653811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1801653803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900826904 + 900826905.

It is an arithmetic number, because the mean of its divisors is an integer number (900826905).

Almost surely, 2^1801653809 is an apocalyptic number.

It is an amenable number.

1801653809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1801653809 is an equidigital number, since it uses as much as digits as its factorization.

1801653809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 1801653809 is about 42445.8927223825. The cubic root of 1801653809 is about 1216.8128332389.

The spelling of 1801653809 in words is "one billion, eight hundred one million, six hundred fifty-three thousand, eight hundred nine".