6620917 has 4 divisors (see below), whose sum is σ = 6628096. Its totient is φ = 6613740.

The previous prime is 6620899. The next prime is 6620927. The reversal of 6620917 is 7190266.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7190266 = 2 ⋅3595133.

It is a cyclic number.

It is not a de Polignac number, because 6620917 - 2¹⁵ = 6588149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6620927) 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, 1959 + ... + 4132.

It is an arithmetic number, because the mean of its divisors is an integer number (1657024).

Almost surely, 2^6620917 is an apocalyptic number.

It is an amenable number.

6620917 is a deficient number, since it is larger than the sum of its proper divisors (7179).

6620917 is a wasteful number, since it uses less digits than its factorization.

6620917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7178.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 6620917 is about 2573.1142609686. The cubic root of 6620917 is about 187.7756963487.

The spelling of 6620917 in words is "six million, six hundred twenty thousand, nine hundred seventeen".