968991 has 4 divisors (see below), whose sum is σ = 1291992. Its totient is φ = 645992.

The previous prime is 968971. The next prime is 969011. The reversal of 968991 is 199869.

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

It is an interprime number because it is at equal distance from previous prime (968971) and next prime (969011).

It is a cyclic number.

It is not a de Polignac number, because 968991 - 2⁵ = 968959 is a prime.

It is a D-number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 968991.

It is not an unprimeable number, because it can be changed into a prime (968911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161496 + ... + 161501.

It is an arithmetic number, because the mean of its divisors is an integer number (322998).

2⁹⁶⁸⁹⁹¹ is an apocalyptic number.

968991 is a deficient number, since it is larger than the sum of its proper divisors (323001).

968991 is a wasteful number, since it uses less digits than its factorization.

968991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323000.

The product of its digits is 34992, while the sum is 42.

The square root of 968991 is about 984.3734047606. The cubic root of 968991 is about 98.9554947391.

The spelling of 968991 in words is "nine hundred sixty-eight thousand, nine hundred ninety-one".