1255126549 has 4 divisors (see below), whose sum is σ = 1278808236. Its totient is φ = 1231444864.

The previous prime is 1255126547. The next prime is 1255126559. The reversal of 1255126549 is 9456215521.

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 448168900 + 806957649 = 21170^2 + 28407^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255126549 - 2¹ = 1255126547 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255126547) 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, 11840764 + ... + 11840869.

It is an arithmetic number, because the mean of its divisors is an integer number (319702059).

Almost surely, 2^1255126549 is an apocalyptic number.

It is an amenable number.

1255126549 is a deficient number, since it is larger than the sum of its proper divisors (23681687).

1255126549 is an equidigital number, since it uses as much as digits as its factorization.

1255126549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23681686.

The product of its digits is 108000, while the sum is 40.

The square root of 1255126549 is about 35427.7652272903. The cubic root of 1255126549 is about 1078.6879783722.

The spelling of 1255126549 in words is "one billion, two hundred fifty-five million, one hundred twenty-six thousand, five hundred forty-nine".