1252715257 has 2 divisors, whose sum is σ = 1252715258. Its totient is φ = 1252715256.

The previous prime is 1252715249. The next prime is 1252715279. The reversal of 1252715257 is 7525172521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 965717776 + 286997481 = 31076^2 + 16941^2 .

It is an emirp because it is prime and its reverse (7525172521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1252715257 - 2³ = 1252715249 is a prime.

It is not a weakly prime, because it can be changed into another prime (1252715237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626357628 + 626357629.

It is an arithmetic number, because the mean of its divisors is an integer number (626357629).

Almost surely, 2^1252715257 is an apocalyptic number.

It is an amenable number.

1252715257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1252715257 is an equidigital number, since it uses as much as digits as its factorization.

1252715257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49000, while the sum is 37.

The square root of 1252715257 is about 35393.7177617724. The cubic root of 1252715257 is about 1077.9967601212.

Adding to 1252715257 its reverse (7525172521), we get a palindrome (8777887778).

The spelling of 1252715257 in words is "one billion, two hundred fifty-two million, seven hundred fifteen thousand, two hundred fifty-seven".