616743021 has 8 divisors (see below), whose sum is σ = 865604320. Its totient is φ = 389521872.

The previous prime is 616743019. The next prime is 616743077. The reversal of 616743021 is 120347616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 616743021 - 2¹ = 616743019 is a prime.

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 616743021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616743521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5409970 + ... + 5410083.

It is an arithmetic number, because the mean of its divisors is an integer number (108200540).

Almost surely, 2^616743021 is an apocalyptic number.

It is an amenable number.

616743021 is a deficient number, since it is larger than the sum of its proper divisors (248861299).

616743021 is a wasteful number, since it uses less digits than its factorization.

616743021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10820075.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 616743021 is about 24834.3113655281. The cubic root of 616743021 is about 851.2061405164.

The spelling of 616743021 in words is "six hundred sixteen million, seven hundred forty-three thousand, twenty-one".