6465991 has 6 divisors (see below), whose sum is σ = 7521720. Its totient is φ = 5542236.

The previous prime is 6465959. The next prime is 6465997. The reversal of 6465991 is 1995646.

It is not a de Polignac number, because 6465991 - 2⁵ = 6465959 is a prime.

It is a super-2 number, since 2×6465991² = 83618079224162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6465997) 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, 65931 + ... + 66028.

It is an arithmetic number, because the mean of its divisors is an integer number (1253620).

Almost surely, 2^6465991 is an apocalyptic number.

6465991 is a deficient number, since it is larger than the sum of its proper divisors (1055729).

6465991 is a wasteful number, since it uses less digits than its factorization.

6465991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131973 (or 131966 counting only the distinct ones).

The product of its digits is 58320, while the sum is 40.

The square root of 6465991 is about 2542.8312960163. The cubic root of 6465991 is about 186.2995039799.

The spelling of 6465991 in words is "six million, four hundred sixty-five thousand, nine hundred ninety-one".