616624621 has 4 divisors (see below), whose sum is σ = 620317152. Its totient is φ = 612932092.

The previous prime is 616624609. The next prime is 616624633. The reversal of 616624621 is 126426616.

616624621 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.

It is an interprime number because it is at equal distance from previous prime (616624609) and next prime (616624633).

It is a cyclic number.

It is not a de Polignac number, because 616624621 - 2⁹ = 616624109 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 (616624691) 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, 1846015 + ... + 1846348.

It is an arithmetic number, because the mean of its divisors is an integer number (155079288).

Almost surely, 2^616624621 is an apocalyptic number.

It is an amenable number.

616624621 is a deficient number, since it is larger than the sum of its proper divisors (3692531).

616624621 is a wasteful number, since it uses less digits than its factorization.

616624621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3692530.

The product of its digits is 20736, while the sum is 34.

The square root of 616624621 is about 24831.9274523747. The cubic root of 616624621 is about 851.1516665817.

The spelling of 616624621 in words is "six hundred sixteen million, six hundred twenty-four thousand, six hundred twenty-one".