1251286263 has 12 divisors (see below), whose sum is σ = 1865717568. Its totient is φ = 807281280.

The previous prime is 1251286261. The next prime is 1251286271. The reversal of 1251286263 is 3626821521.

1251286263 is a `hidden beast` number, since 1 + 2 + 5 + 1 + 28 + 626 + 3 = 666.

It is not a de Polignac number, because 1251286263 - 2¹ = 1251286261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251286261) 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 11 ways as a sum of consecutive naturals, for example, 2242170 + ... + 2242727.

It is an arithmetic number, because the mean of its divisors is an integer number (155476464).

Almost surely, 2^1251286263 is an apocalyptic number.

1251286263 is a deficient number, since it is larger than the sum of its proper divisors (614431305).

1251286263 is a wasteful number, since it uses less digits than its factorization.

1251286263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4484934 (or 4484931 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 1251286263 is about 35373.5248879724. The cubic root of 1251286263 is about 1077.5867076359.

The spelling of 1251286263 in words is "one billion, two hundred fifty-one million, two hundred eighty-six thousand, two hundred sixty-three".