965991 has 32 divisors (see below), whose sum is σ = 1548288. Its totient is φ = 529920.

The previous prime is 965989. The next prime is 966011. The reversal of 965991 is 199569.

It is not a de Polignac number, because 965991 - 2¹ = 965989 is a prime.

It is a super-2 number, since 2×965991² = 1866277224162, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (965191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20530 + ... + 20576.

It is an arithmetic number, because the mean of its divisors is an integer number (48384).

2⁹⁶⁵⁹⁹¹ is an apocalyptic number.

965991 is a deficient number, since it is larger than the sum of its proper divisors (582297).

965991 is a wasteful number, since it uses less digits than its factorization.

965991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111.

The product of its digits is 21870, while the sum is 39.

The square root of 965991 is about 982.8484115061. The cubic root of 965991 is about 98.8532669651.

The spelling of 965991 in words is "nine hundred sixty-five thousand, nine hundred ninety-one".