1255617997 has 8 divisors (see below), whose sum is σ = 1267207200. Its totient is φ = 1244065584.

The previous prime is 1255617991. The next prime is 1255618043. The reversal of 1255617997 is 7997165521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1255617997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255617991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61878 + ... + 79624.

It is an arithmetic number, because the mean of its divisors is an integer number (158400900).

Almost surely, 2^1255617997 is an apocalyptic number.

It is an amenable number.

1255617997 is a deficient number, since it is larger than the sum of its proper divisors (11589203).

1255617997 is a wasteful number, since it uses less digits than its factorization.

1255617997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18395.

The product of its digits is 1190700, while the sum is 52.

The square root of 1255617997 is about 35434.7004643753. The cubic root of 1255617997 is about 1078.8287476769.

The spelling of 1255617997 in words is "one billion, two hundred fifty-five million, six hundred seventeen thousand, nine hundred ninety-seven".