6791621 has 4 divisors (see below), whose sum is σ = 6820044. Its totient is φ = 6763200.

The previous prime is 6791599. The next prime is 6791623. The reversal of 6791621 is 1261976.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5712100 + 1079521 = 2390^2 + 1039^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6791621 is a prime.

It is a super-2 number, since 2×6791621² = 92252231615282, 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 (6791623) 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, 13850 + ... + 14331.

It is an arithmetic number, because the mean of its divisors is an integer number (1705011).

Almost surely, 2^6791621 is an apocalyptic number.

It is an amenable number.

6791621 is a deficient number, since it is larger than the sum of its proper divisors (28423).

6791621 is a wasteful number, since it uses less digits than its factorization.

6791621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28422.

The product of its digits is 4536, while the sum is 32.

The square root of 6791621 is about 2606.0738669501. The cubic root of 6791621 is about 189.3758001542.

The spelling of 6791621 in words is "six million, seven hundred ninety-one thousand, six hundred twenty-one".