1268253257 has 4 divisors (see below), whose sum is σ = 1289044356. Its totient is φ = 1247462160.

The previous prime is 1268253253. The next prime is 1268253289. The reversal of 1268253257 is 7523528621.

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 355548736 + 912704521 = 18856^2 + 30211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1268253257 - 2² = 1268253253 is a prime.

It is a super-2 number, since 2×1268253257² = 3216932647782216098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1268253253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10395458 + ... + 10395579.

It is an arithmetic number, because the mean of its divisors is an integer number (322261089).

Almost surely, 2^1268253257 is an apocalyptic number.

It is an amenable number.

1268253257 is a deficient number, since it is larger than the sum of its proper divisors (20791099).

1268253257 is an equidigital number, since it uses as much as digits as its factorization.

1268253257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20791098.

The product of its digits is 201600, while the sum is 41.

The square root of 1268253257 is about 35612.5435345469. The cubic root of 1268253257 is about 1082.4354210168.

The spelling of 1268253257 in words is "one billion, two hundred sixty-eight million, two hundred fifty-three thousand, two hundred fifty-seven".