465991 has 4 divisors (see below), whose sum is σ = 476872. Its totient is φ = 455112.

The previous prime is 465989. The next prime is 466009. The reversal of 465991 is 199564.

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

It is not a de Polignac number, because 465991 - 2¹ = 465989 is a prime.

It is a super-2 number, since 2×465991² = 434295224162, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (465901) 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, 5376 + ... + 5461.

It is an arithmetic number, because the mean of its divisors is an integer number (119218).

2⁴⁶⁵⁹⁹¹ is an apocalyptic number.

465991 is a deficient number, since it is larger than the sum of its proper divisors (10881).

465991 is a wasteful number, since it uses less digits than its factorization.

465991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10880.

The product of its digits is 9720, while the sum is 34.

The square root of 465991 is about 682.6353345674. The cubic root of 465991 is about 77.5281063509.

The spelling of 465991 in words is "four hundred sixty-five thousand, nine hundred ninety-one".