1801255889 has 2 divisors, whose sum is σ = 1801255890. Its totient is φ = 1801255888.

The previous prime is 1801255783. The next prime is 1801255891. The reversal of 1801255889 is 9885521081.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1651609600 + 149646289 = 40640^2 + 12233^2 .

It is a cyclic number.

It is not a de Polignac number, because 1801255889 - 2²⁰ = 1800207313 is a prime.

Together with 1801255891, 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 (1801255289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900627944 + 900627945.

It is an arithmetic number, because the mean of its divisors is an integer number (900627945).

Almost surely, 2^1801255889 is an apocalyptic number.

It is an amenable number.

1801255889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1801255889 is an equidigital number, since it uses as much as digits as its factorization.

1801255889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 230400, while the sum is 47.

The square root of 1801255889 is about 42441.2050842103. The cubic root of 1801255889 is about 1216.7232433648.

The spelling of 1801255889 in words is "one billion, eight hundred one million, two hundred fifty-five thousand, eight hundred eighty-nine".