6690461 has 4 divisors (see below), whose sum is σ = 6710652. Its totient is φ = 6670272.

The previous prime is 6690433. The next prime is 6690473. The reversal of 6690461 is 1640966.

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 1428025 + 5262436 = 1195^2 + 2294^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6690461 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6690361) 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, 9590 + ... + 10263.

It is an arithmetic number, because the mean of its divisors is an integer number (1677663).

Almost surely, 2^6690461 is an apocalyptic number.

It is an amenable number.

6690461 is a deficient number, since it is larger than the sum of its proper divisors (20191).

6690461 is a wasteful number, since it uses less digits than its factorization.

6690461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20190.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 6690461 is about 2586.5925461889. The cubic root of 6690461 is about 188.4308531593.

The spelling of 6690461 in words is "six million, six hundred ninety thousand, four hundred sixty-one".