9994551691 has 8 divisors (see below), whose sum is σ = 10322627040. Its totient is φ = 9671643072.

The previous prime is 9994551689. The next prime is 9994551709. The reversal of 9994551691 is 1961554999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9994551691 - 2¹ = 9994551689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9994551641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1287751 + ... + 1295488.

It is an arithmetic number, because the mean of its divisors is an integer number (1290328380).

Almost surely, 2^9994551691 is an apocalyptic number.

9994551691 is a deficient number, since it is larger than the sum of its proper divisors (328075349).

9994551691 is a wasteful number, since it uses less digits than its factorization.

9994551691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2583365.

The product of its digits is 3936600, while the sum is 58.

The square root of 9994551691 is about 99972.7547434800. The cubic root of 9994551691 is about 2154.0433514218.

The spelling of 9994551691 in words is "nine billion, nine hundred ninety-four million, five hundred fifty-one thousand, six hundred ninety-one".