1251251253 has 32 divisors (see below), whose sum is σ = 2124320000. Its totient is φ = 713043648.

The previous prime is 1251251227. The next prime is 1251251263. The reversal of 1251251253 is 3521521521.

It is not a de Polignac number, because 1251251253 - 2¹² = 1251247157 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251251263) 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 31 ways as a sum of consecutive naturals, for example, 61623 + ... + 79371.

It is an arithmetic number, because the mean of its divisors is an integer number (66385000).

Almost surely, 2^1251251253 is an apocalyptic number.

It is an amenable number.

1251251253 is a deficient number, since it is larger than the sum of its proper divisors (873068747).

1251251253 is a wasteful number, since it uses less digits than its factorization.

1251251253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18138 (or 18132 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 1251251253 is about 35373.0300228861. The cubic root of 1251251253 is about 1077.5766575343.

Adding to 1251251253 its reverse (3521521521), we get a palindrome (4772772774).

The spelling of 1251251253 in words is "one billion, two hundred fifty-one million, two hundred fifty-one thousand, two hundred fifty-three".