6410991 has 4 divisors (see below), whose sum is σ = 8547992. Its totient is φ = 4273992.

The previous prime is 6410981. The next prime is 6410993. The reversal of 6410991 is 1990146.

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

It is not a de Polignac number, because 6410991 - 2⁵ = 6410959 is a prime.

It is a super-2 number, since 2×6410991² = 82201611204162, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

6410991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6410993) 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, 1068496 + ... + 1068501.

It is an arithmetic number, because the mean of its divisors is an integer number (2136998).

Almost surely, 2^6410991 is an apocalyptic number.

6410991 is a deficient number, since it is larger than the sum of its proper divisors (2137001).

6410991 is a wasteful number, since it uses less digits than its factorization.

6410991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2137000.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 6410991 is about 2531.9934834039. The cubic root of 6410991 is about 185.7697752755.

The spelling of 6410991 in words is "six million, four hundred ten thousand, nine hundred ninety-one".