1255271657 has 4 divisors (see below), whose sum is σ = 1289197956. Its totient is φ = 1221345360.

The previous prime is 1255271617. The next prime is 1255271659. The reversal of 1255271657 is 7561725521.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 602162521 + 653109136 = 24539^2 + 25556^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255271657 - 2⁶ = 1255271593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1255271659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16963094 + ... + 16963167.

It is an arithmetic number, because the mean of its divisors is an integer number (322299489).

Almost surely, 2^1255271657 is an apocalyptic number.

It is an amenable number.

1255271657 is a deficient number, since it is larger than the sum of its proper divisors (33926299).

1255271657 is an equidigital number, since it uses as much as digits as its factorization.

1255271657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33926298.

The product of its digits is 147000, while the sum is 41.

The square root of 1255271657 is about 35429.8131098655. The cubic root of 1255271657 is about 1078.7295466172.

The spelling of 1255271657 in words is "one billion, two hundred fifty-five million, two hundred seventy-one thousand, six hundred fifty-seven".