1255738817 has 8 divisors (see below), whose sum is σ = 1281012096. Its totient is φ = 1230717312.

The previous prime is 1255738811. The next prime is 1255738853. The reversal of 1255738817 is 7188375521.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1255738817 - 2¹⁶ = 1255673281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255738811) 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, 52853 + ... + 72834.

It is an arithmetic number, because the mean of its divisors is an integer number (160126512).

Almost surely, 2^1255738817 is an apocalyptic number.

It is an amenable number.

1255738817 is a deficient number, since it is larger than the sum of its proper divisors (25273279).

1255738817 is a wasteful number, since it uses less digits than its factorization.

1255738817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125887.

The product of its digits is 470400, while the sum is 47.

The square root of 1255738817 is about 35436.4052494042. The cubic root of 1255738817 is about 1078.8633494717.

The spelling of 1255738817 in words is "one billion, two hundred fifty-five million, seven hundred thirty-eight thousand, eight hundred seventeen".