1255378769 has 2 divisors, whose sum is σ = 1255378770. Its totient is φ = 1255378768.

The previous prime is 1255378739. The next prime is 1255378777. The reversal of 1255378769 is 9678735521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1218010000 + 37368769 = 34900^2 + 6113^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1255378769 is a prime.

It is a super-3 number, since 3×1255378769³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1255378769.

It is not a weakly prime, because it can be changed into another prime (1255378739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627689384 + 627689385.

It is an arithmetic number, because the mean of its divisors is an integer number (627689385).

Almost surely, 2^1255378769 is an apocalyptic number.

It is an amenable number.

1255378769 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255378769 is an equidigital number, since it uses as much as digits as its factorization.

1255378769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3175200, while the sum is 53.

The square root of 1255378769 is about 35431.3246859329. The cubic root of 1255378769 is about 1078.7602283139.

The spelling of 1255378769 in words is "one billion, two hundred fifty-five million, three hundred seventy-eight thousand, seven hundred sixty-nine".