1251116333 has 2 divisors, whose sum is σ = 1251116334. Its totient is φ = 1251116332.

The previous prime is 1251116329. The next prime is 1251116341. The reversal of 1251116333 is 3336111521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1250541769 + 574564 = 35363^2 + 758^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251116333 - 2² = 1251116329 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251116323) 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 as a sum of consecutive naturals, namely, 625558166 + 625558167.

It is an arithmetic number, because the mean of its divisors is an integer number (625558167).

Almost surely, 2^1251116333 is an apocalyptic number.

It is an amenable number.

1251116333 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251116333 is an equidigital number, since it uses as much as digits as its factorization.

1251116333 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 26.

The square root of 1251116333 is about 35371.1228688036. The cubic root of 1251116333 is about 1077.5379251405.

Adding to 1251116333 its reverse (3336111521), we get a palindrome (4587227854).

The spelling of 1251116333 in words is "one billion, two hundred fifty-one million, one hundred sixteen thousand, three hundred thirty-three".