1275424749 has 6 divisors (see below), whose sum is σ = 1842280206. Its totient is φ = 850283160.

The previous prime is 1275424651. The next prime is 1275424751. The reversal of 1275424749 is 9474245721.

1275424749 is a `hidden beast` number, since 1 + 27 + 542 + 47 + 49 = 666.

It can be written as a sum of positive squares in only one way, i.e., 666569124 + 608855625 = 25818^2 + 24675^2 .

It is not a de Polignac number, because 1275424749 - 2⁷ = 1275424621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1275424789) 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 5 ways as a sum of consecutive naturals, for example, 70856922 + ... + 70856939.

It is an arithmetic number, because the mean of its divisors is an integer number (307046701).

Almost surely, 2^1275424749 is an apocalyptic number.

It is an amenable number.

1275424749 is a deficient number, since it is larger than the sum of its proper divisors (566855457).

1275424749 is a wasteful number, since it uses less digits than its factorization.

1275424749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141713867 (or 141713864 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 1275424749 is about 35713.0893231039. The cubic root of 1275424749 is about 1084.4718415938.

The spelling of 1275424749 in words is "one billion, two hundred seventy-five million, four hundred twenty-four thousand, seven hundred forty-nine".