7899992251 has 2 divisors, whose sum is σ = 7899992252. Its totient is φ = 7899992250.

The previous prime is 7899992231. The next prime is 7899992267. The reversal of 7899992251 is 1522999987.

It is a strong prime.

It is an emirp because it is prime and its reverse (1522999987) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7899992251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7899992251.

It is not a weakly prime, because it can be changed into another prime (7899992231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3949996125 + 3949996126.

It is an arithmetic number, because the mean of its divisors is an integer number (3949996126).

Almost surely, 2^7899992251 is an apocalyptic number.

7899992251 is a deficient number, since it is larger than the sum of its proper divisors (1).

7899992251 is an equidigital number, since it uses as much as digits as its factorization.

7899992251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7348320, while the sum is 61.

The square root of 7899992251 is about 88881.9005816145. The cubic root of 7899992251 is about 1991.6310501018.

The spelling of 7899992251 in words is "seven billion, eight hundred ninety-nine million, nine hundred ninety-two thousand, two hundred fifty-one".