6479991 has 24 divisors (see below), whose sum is σ = 10851360. Its totient is φ = 3649536.

The previous prime is 6479989. The next prime is 6479999. The reversal of 6479991 is 1999746.

6479991 is digitally balanced in base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6479991 - 2¹ = 6479989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6479999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3895 + ... + 5303.

It is an arithmetic number, because the mean of its divisors is an integer number (452140).

Almost surely, 2^6479991 is an apocalyptic number.

6479991 is a deficient number, since it is larger than the sum of its proper divisors (4371369).

6479991 is a wasteful number, since it uses less digits than its factorization.

6479991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1495 (or 1492 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 6479991 is about 2545.5826445040. The cubic root of 6479991 is about 186.4338640452.

The spelling of 6479991 in words is "six million, four hundred seventy-nine thousand, nine hundred ninety-one".