616857121 has 4 divisors (see below), whose sum is σ = 653142852. Its totient is φ = 580571392.

The previous prime is 616857083. The next prime is 616857133. The reversal of 616857121 is 121758616.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 545876496 + 70980625 = 23364^2 + 8425^2 .

It is a cyclic number.

It is not a de Polignac number, because 616857121 - 2²³ = 608468513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616857221) 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, 18142840 + ... + 18142873.

It is an arithmetic number, because the mean of its divisors is an integer number (163285713).

Almost surely, 2^616857121 is an apocalyptic number.

It is an amenable number.

616857121 is a deficient number, since it is larger than the sum of its proper divisors (36285731).

616857121 is a wasteful number, since it uses less digits than its factorization.

616857121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36285730.

The product of its digits is 20160, while the sum is 37.

The square root of 616857121 is about 24836.6084842516. The cubic root of 616857121 is about 851.2586294940.

The spelling of 616857121 in words is "six hundred sixteen million, eight hundred fifty-seven thousand, one hundred twenty-one".