6446691 has 6 divisors (see below), whose sum is σ = 9311900. Its totient is φ = 4297788.

The previous prime is 6446669. The next prime is 6446711. The reversal of 6446691 is 1966446.

6446691 is a `hidden beast` number, since 644 + 6 + 6 + 9 + 1 = 666.

It is not a de Polignac number, because 6446691 - 2⁵ = 6446659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6446611) 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, 358141 + ... + 358158.

Almost surely, 2^6446691 is an apocalyptic number.

6446691 is a deficient number, since it is larger than the sum of its proper divisors (2865209).

6446691 is a wasteful number, since it uses less digits than its factorization.

6446691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716305 (or 716302 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 6446691 is about 2539.0334775264. The cubic root of 6446691 is about 186.1139606867.

The spelling of 6446691 in words is "six million, four hundred forty-six thousand, six hundred ninety-one".