967991 has 6 divisors (see below), whose sum is σ = 1003392. Its totient is φ = 933800.

The previous prime is 967979. The next prime is 967999. The reversal of 967991 is 199769.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-967991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (967999) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 266 + ... + 1416.

It is an arithmetic number, because the mean of its divisors is an integer number (167232).

2⁹⁶⁷⁹⁹¹ is an apocalyptic number.

967991 is a deficient number, since it is larger than the sum of its proper divisors (35401).

967991 is a wasteful number, since it uses less digits than its factorization.

967991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209 (or 1180 counting only the distinct ones).

The product of its digits is 30618, while the sum is 41.

The square root of 967991 is about 983.8653363139. The cubic root of 967991 is about 98.9214422884.

The spelling of 967991 in words is "nine hundred sixty-seven thousand, nine hundred ninety-one".