2617921 has 4 divisors (see below), whose sum is σ = 2621232. Its totient is φ = 2614612.

The previous prime is 2617907. The next prime is 2617957. The reversal of 2617921 is 1297162.

It is a happy number.

2617921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 2617921 - 2⁷ = 2617793 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2617921.

It is not an unprimeable number, because it can be changed into a prime (2617961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 306 + ... + 2308.

It is an arithmetic number, because the mean of its divisors is an integer number (655308).

2^2617921 is an apocalyptic number.

It is an amenable number.

2617921 is a deficient number, since it is larger than the sum of its proper divisors (3311).

2617921 is a wasteful number, since it uses less digits than its factorization.

2617921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3310.

The product of its digits is 1512, while the sum is 28.

The square root of 2617921 is about 1617.9990729293. Note that the first 3 decimals coincide. The cubic root of 2617921 is about 137.8220944896.

The spelling of 2617921 in words is "two million, six hundred seventeen thousand, nine hundred twenty-one".