1251116133 has 8 divisors (see below), whose sum is σ = 1671151968. Its totient is φ = 832578864.

The previous prime is 1251116051. The next prime is 1251116137. The reversal of 1251116133 is 3316111521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1251116133 - 2²⁰ = 1250067557 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 (1251116137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 372691 + ... + 376032.

It is an arithmetic number, because the mean of its divisors is an integer number (208893996).

Almost surely, 2^1251116133 is an apocalyptic number.

It is an amenable number.

1251116133 is a deficient number, since it is larger than the sum of its proper divisors (420035835).

1251116133 is an equidigital number, since it uses as much as digits as its factorization.

1251116133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749283.

The product of its digits is 540, while the sum is 24.

The square root of 1251116133 is about 35371.1200416385. The cubic root of 1251116133 is about 1077.5378677231.

Adding to 1251116133 its reverse (3316111521), we get a palindrome (4567227654).

The spelling of 1251116133 in words is "one billion, two hundred fifty-one million, one hundred sixteen thousand, one hundred thirty-three".