1255523989 has 2 divisors, whose sum is σ = 1255523990. Its totient is φ = 1255523988.

The previous prime is 1255523981. The next prime is 1255524029. The reversal of 1255523989 is 9893255521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1222691089 + 32832900 = 34967^2 + 5730^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255523989 - 2³ = 1255523981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1255523981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627761994 + 627761995.

It is an arithmetic number, because the mean of its divisors is an integer number (627761995).

Almost surely, 2^1255523989 is an apocalyptic number.

It is an amenable number.

1255523989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255523989 is an equidigital number, since it uses as much as digits as its factorization.

1255523989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972000, while the sum is 49.

The square root of 1255523989 is about 35433.3739432191. The cubic root of 1255523989 is about 1078.8018230697.

The spelling of 1255523989 in words is "one billion, two hundred fifty-five million, five hundred twenty-three thousand, nine hundred eighty-nine".