621005617 has 4 divisors (see below), whose sum is σ = 621060336. Its totient is φ = 620950900.

The previous prime is 621005587. The next prime is 621005653. The reversal of 621005617 is 716500126.

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 621005617 - 2¹¹ = 621003569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621005657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3259 + ... + 35392.

It is an arithmetic number, because the mean of its divisors is an integer number (155265084).

Almost surely, 2^621005617 is an apocalyptic number.

It is an amenable number.

621005617 is a deficient number, since it is larger than the sum of its proper divisors (54719).

621005617 is a wasteful number, since it uses less digits than its factorization.

621005617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54718.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 621005617 is about 24919.9842897222. The cubic root of 621005617 is about 853.1626662506.

The spelling of 621005617 in words is "six hundred twenty-one million, five thousand, six hundred seventeen".