1255167917 has 2 divisors, whose sum is σ = 1255167918. Its totient is φ = 1255167916.

The previous prime is 1255167877. The next prime is 1255167929. The reversal of 1255167917 is 7197615521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 876515236 + 378652681 = 29606^2 + 19459^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1255167917 is a prime.

It is a super-2 number, since 2×1255167917² = 3150892999732237778, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1255167997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627583958 + 627583959.

It is an arithmetic number, because the mean of its divisors is an integer number (627583959).

Almost surely, 2^1255167917 is an apocalyptic number.

It is an amenable number.

1255167917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255167917 is an equidigital number, since it uses as much as digits as its factorization.

1255167917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 132300, while the sum is 44.

The square root of 1255167917 is about 35428.3490583459. The cubic root of 1255167917 is about 1078.6998291491.

The spelling of 1255167917 in words is "one billion, two hundred fifty-five million, one hundred sixty-seven thousand, nine hundred seventeen".