991619167 has 8 divisors (see below), whose sum is σ = 1236304512. Its totient is φ = 772690200.

The previous prime is 991619149. The next prime is 991619249. The reversal of 991619167 is 761916199.

It is a happy number.

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 991619167 - 2¹⁹ = 991094879 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 991619167.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991619117) 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, 6439009 + ... + 6439162.

It is an arithmetic number, because the mean of its divisors is an integer number (154538064).

Almost surely, 2^991619167 is an apocalyptic number.

991619167 is a deficient number, since it is larger than the sum of its proper divisors (244685345).

991619167 is a wasteful number, since it uses less digits than its factorization.

991619167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12878189.

The product of its digits is 183708, while the sum is 49.

The square root of 991619167 is about 31489.9851857698. The cubic root of 991619167 is about 997.1985481965.

The spelling of 991619167 in words is "nine hundred ninety-one million, six hundred nineteen thousand, one hundred sixty-seven".