1251275013 has 16 divisors (see below), whose sum is σ = 1871069760. Its totient is φ = 826385328.

The previous prime is 1251274967. The next prime is 1251275027. The reversal of 1251275013 is 3105721521.

It is not a de Polignac number, because 1251275013 - 2¹⁴ = 1251258629 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251275033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213670 + ... + 219447.

It is an arithmetic number, because the mean of its divisors is an integer number (116941860).

Almost surely, 2^1251275013 is an apocalyptic number.

It is an amenable number.

1251275013 is a deficient number, since it is larger than the sum of its proper divisors (619794747).

1251275013 is a wasteful number, since it uses less digits than its factorization.

1251275013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433233 (or 433227 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 1251275013 is about 35373.3658703833. The cubic root of 1251275013 is about 1077.5834781893.

Adding to 1251275013 its reverse (3105721521), we get a palindrome (4356996534).

The spelling of 1251275013 in words is "one billion, two hundred fifty-one million, two hundred seventy-five thousand, thirteen".