1275724057 has 2 divisors, whose sum is σ = 1275724058. Its totient is φ = 1275724056.

The previous prime is 1275724001. The next prime is 1275724063. The reversal of 1275724057 is 7504275721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1237913856 + 37810201 = 35184^2 + 6149^2 .

It is an emirp because it is prime and its reverse (7504275721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1275724057 - 2²³ = 1267335449 is a prime.

It is not a weakly prime, because it can be changed into another prime (1275724757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637862028 + 637862029.

It is an arithmetic number, because the mean of its divisors is an integer number (637862029).

Almost surely, 2^1275724057 is an apocalyptic number.

It is an amenable number.

1275724057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1275724057 is an equidigital number, since it uses as much as digits as its factorization.

1275724057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 137200, while the sum is 40.

The square root of 1275724057 is about 35717.2795296618. The cubic root of 1275724057 is about 1084.5566671158.

Adding to 1275724057 its reverse (7504275721), we get a palindrome (8779999778).

The spelling of 1275724057 in words is "one billion, two hundred seventy-five million, seven hundred twenty-four thousand, fifty-seven".