1255497489 has 45 divisors (see below), whose sum is σ = 1953327321. Its totient is φ = 803620440.

The previous prime is 1255497437. The next prime is 1255497491. The reversal of 1255497489 is 9847945521.

It is a happy number.

The square root of 1255497489 is 35433.

It is a perfect power (a square), and thus also a powerful number.

1255497489 is a `hidden beast` number, since 1 + 2 + 554 + 9 + 7 + 4 + 89 = 666.

It is not a de Polignac number, because 1255497489 - 2²⁹ = 718626577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1255497499) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 9885744 + ... + 9885870.

Almost surely, 2^1255497489 is an apocalyptic number.

1255497489 is the 35433-rd square number.

1255497489 is the 17717-th centered octagonal number.

It is an amenable number.

1255497489 is a deficient number, since it is larger than the sum of its proper divisors (697829832).

1255497489 is an frugal number, since it uses more digits than its factorization.

1255497489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328 (or 161 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 54.

The cubic root of 1255497489 is about 1078.7942330251.

The spelling of 1255497489 in words is "one billion, two hundred fifty-five million, four hundred ninety-seven thousand, four hundred eighty-nine".