958991 has 4 divisors (see below), whose sum is σ = 1046184. Its totient is φ = 871800.

The previous prime is 958973. The next prime is 959009. The reversal of 958991 is 199859.

958991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199859 = 11 ⋅18169.

It is an interprime number because it is at equal distance from previous prime (958973) and next prime (959009).

It is a cyclic number.

It is not a de Polignac number, because 958991 - 2¹⁴ = 942607 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 (958901) 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, 43580 + ... + 43601.

It is an arithmetic number, because the mean of its divisors is an integer number (261546).

2⁹⁵⁸⁹⁹¹ is an apocalyptic number.

958991 is a deficient number, since it is larger than the sum of its proper divisors (87193).

958991 is a wasteful number, since it uses less digits than its factorization.

958991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87192.

The product of its digits is 29160, while the sum is 41.

The square root of 958991 is about 979.2808585896. The cubic root of 958991 is about 98.6139096357.

The spelling of 958991 in words is "nine hundred fifty-eight thousand, nine hundred ninety-one".