9951394811 has 4 divisors (see below), whose sum is σ = 9958035000. Its totient is φ = 9944754624.

The previous prime is 9951394807. The next prime is 9951394813. The reversal of 9951394811 is 1184931599.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9951394811 - 2² = 9951394807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9951394811.

It is not an unprimeable number, because it can be changed into a prime (9951394813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3317846 + ... + 3320843.

It is an arithmetic number, because the mean of its divisors is an integer number (2489508750).

Almost surely, 2^9951394811 is an apocalyptic number.

9951394811 is a deficient number, since it is larger than the sum of its proper divisors (6640189).

9951394811 is a wasteful number, since it uses less digits than its factorization.

9951394811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6640188.

The product of its digits is 349920, while the sum is 50.

The square root of 9951394811 is about 99756.6780270875. The cubic root of 9951394811 is about 2150.9384625622.

The spelling of 9951394811 in words is "nine billion, nine hundred fifty-one million, three hundred ninety-four thousand, eight hundred eleven".