6625691 has 4 divisors (see below), whose sum is σ = 6637752. Its totient is φ = 6613632.

The previous prime is 6625687. The next prime is 6625693. The reversal of 6625691 is 1965266.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1965266 = 2 ⋅982633.

It is a cyclic number.

It is not a de Polignac number, because 6625691 - 2² = 6625687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6625693) 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, 5165 + ... + 6318.

It is an arithmetic number, because the mean of its divisors is an integer number (1659438).

Almost surely, 2^6625691 is an apocalyptic number.

6625691 is a deficient number, since it is larger than the sum of its proper divisors (12061).

6625691 is a wasteful number, since it uses less digits than its factorization.

6625691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12060.

The product of its digits is 19440, while the sum is 35.

The square root of 6625691 is about 2574.0417634530. The cubic root of 6625691 is about 187.8208172789.

The spelling of 6625691 in words is "six million, six hundred twenty-five thousand, six hundred ninety-one".