1255378749 has 4 divisors (see below), whose sum is σ = 1673838336. Its totient is φ = 836919164.

The previous prime is 1255378739. The next prime is 1255378769. The reversal of 1255378749 is 9478735521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1255378749 - 2²⁰ = 1254330173 is a prime.

It is a super-3 number, since 3×1255378749³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255378739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209229789 + ... + 209229794.

It is an arithmetic number, because the mean of its divisors is an integer number (418459584).

Almost surely, 2^1255378749 is an apocalyptic number.

It is an amenable number.

1255378749 is a deficient number, since it is larger than the sum of its proper divisors (418459587).

1255378749 is an equidigital number, since it uses as much as digits as its factorization.

1255378749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418459586.

The product of its digits is 2116800, while the sum is 51.

The square root of 1255378749 is about 35431.3244036968. The cubic root of 1255378749 is about 1078.7602225851.

The spelling of 1255378749 in words is "one billion, two hundred fifty-five million, three hundred seventy-eight thousand, seven hundred forty-nine".