9128991251 has 2 divisors, whose sum is σ = 9128991252. Its totient is φ = 9128991250.

The previous prime is 9128991239. The next prime is 9128991257. The reversal of 9128991251 is 1521998219.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9128991251 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9128991196 and 9128991205.

It is not a weakly prime, because it can be changed into another prime (9128991257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4564495625 + 4564495626.

It is an arithmetic number, because the mean of its divisors is an integer number (4564495626).

Almost surely, 2^9128991251 is an apocalyptic number.

9128991251 is a deficient number, since it is larger than the sum of its proper divisors (1).

9128991251 is an equidigital number, since it uses as much as digits as its factorization.

9128991251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 47.

The square root of 9128991251 is about 95545.7547513232. The cubic root of 9128991251 is about 2089.9742257759.

The spelling of 9128991251 in words is "nine billion, one hundred twenty-eight million, nine hundred ninety-one thousand, two hundred fifty-one".