1251005253 has 16 divisors (see below), whose sum is σ = 1682246016. Its totient is φ = 826905600.

The previous prime is 1251005237. The next prime is 1251005257. The reversal of 1251005253 is 3525001521.

It is a happy number.

It is not a de Polignac number, because 1251005253 - 2⁴ = 1251005237 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251005257) 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, 266301 + ... + 270957.

It is an arithmetic number, because the mean of its divisors is an integer number (105140376).

Almost surely, 2^1251005253 is an apocalyptic number.

It is an amenable number.

1251005253 is a deficient number, since it is larger than the sum of its proper divisors (431240763).

1251005253 is a wasteful number, since it uses less digits than its factorization.

1251005253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5404.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 1251005253 is about 35369.5526265176. The cubic root of 1251005253 is about 1077.5060345662.

Adding to 1251005253 its reverse (3525001521), we get a palindrome (4776006774).

The spelling of 1251005253 in words is "one billion, two hundred fifty-one million, five thousand, two hundred fifty-three".