1251116329 has 2 divisors, whose sum is σ = 1251116330. Its totient is φ = 1251116328.

The previous prime is 1251116323. The next prime is 1251116333. The reversal of 1251116329 is 9236111521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 995276304 + 255840025 = 31548^2 + 15995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1251116329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1251116329.

It is not a weakly prime, because it can be changed into another prime (1251116323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625558164 + 625558165.

It is an arithmetic number, because the mean of its divisors is an integer number (625558165).

Almost surely, 2^1251116329 is an apocalyptic number.

It is an amenable number.

1251116329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251116329 is an equidigital number, since it uses as much as digits as its factorization.

1251116329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 31.

The square root of 1251116329 is about 35371.1228122603. The cubic root of 1251116329 is about 1077.5379239922.

The spelling of 1251116329 in words is "one billion, two hundred fifty-one million, one hundred sixteen thousand, three hundred twenty-nine".