1255839889 has 2 divisors, whose sum is σ = 1255839890. Its totient is φ = 1255839888.

The previous prime is 1255839863. The next prime is 1255839911. The reversal of 1255839889 is 9889385521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1087878289 + 167961600 = 32983^2 + 12960^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255839889 - 2¹⁹ = 1255315601 is a prime.

It is not a weakly prime, because it can be changed into another prime (1255839989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627919944 + 627919945.

It is an arithmetic number, because the mean of its divisors is an integer number (627919945).

Almost surely, 2^1255839889 is an apocalyptic number.

It is an amenable number.

1255839889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255839889 is an equidigital number, since it uses as much as digits as its factorization.

1255839889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6220800, while the sum is 58.

The square root of 1255839889 is about 35437.8313247298. The cubic root of 1255839889 is about 1078.8922939065.

The spelling of 1255839889 in words is "one billion, two hundred fifty-five million, eight hundred thirty-nine thousand, eight hundred eighty-nine".