9951121379 has 2 divisors, whose sum is σ = 9951121380. Its totient is φ = 9951121378.

The previous prime is 9951121289. The next prime is 9951121381. The reversal of 9951121379 is 9731211599.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9951121379 - 2²⁴ = 9934344163 is a prime.

Together with 9951121381, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9951121979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4975560689 + 4975560690.

It is an arithmetic number, because the mean of its divisors is an integer number (4975560690).

Almost surely, 2^9951121379 is an apocalyptic number.

9951121379 is a deficient number, since it is larger than the sum of its proper divisors (1).

9951121379 is an equidigital number, since it uses as much as digits as its factorization.

9951121379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 153090, while the sum is 47.

The square root of 9951121379 is about 99755.3075229584. The cubic root of 9951121379 is about 2150.9187621147.

The spelling of 9951121379 in words is "nine billion, nine hundred fifty-one million, one hundred twenty-one thousand, three hundred seventy-nine".