616944021 has 4 divisors (see below), whose sum is σ = 822592032. Its totient is φ = 411296012.

The previous prime is 616944011. The next prime is 616944047. The reversal of 616944021 is 120449616.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-616944021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616944001) 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, 102824001 + ... + 102824006.

It is an arithmetic number, because the mean of its divisors is an integer number (205648008).

Almost surely, 2^616944021 is an apocalyptic number.

It is an amenable number.

616944021 is a deficient number, since it is larger than the sum of its proper divisors (205648011).

616944021 is a wasteful number, since it uses less digits than its factorization.

616944021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205648010.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 616944021 is about 24838.3578563479. The cubic root of 616944021 is about 851.2986014199.

The spelling of 616944021 in words is "six hundred sixteen million, nine hundred forty-four thousand, twenty-one".