1251203263 has 2 divisors, whose sum is σ = 1251203264. Its totient is φ = 1251203262.

The previous prime is 1251203249. The next prime is 1251203287. The reversal of 1251203263 is 3623021521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1251203263 - 2²⁹ = 714332351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251203363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625601631 + 625601632.

It is an arithmetic number, because the mean of its divisors is an integer number (625601632).

Almost surely, 2^1251203263 is an apocalyptic number.

1251203263 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251203263 is an equidigital number, since it uses as much as digits as its factorization.

1251203263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1251203263 is about 35372.3516747191. The cubic root of 1251203263 is about 1077.5628810406.

Adding to 1251203263 its reverse (3623021521), we get a palindrome (4874224784).

The spelling of 1251203263 in words is "one billion, two hundred fifty-one million, two hundred three thousand, two hundred sixty-three".