616240921 has 2 divisors, whose sum is σ = 616240922. Its totient is φ = 616240920.

The previous prime is 616240873. The next prime is 616240943. The reversal of 616240921 is 129042616.

616240921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 554838025 + 61402896 = 23555^2 + 7836^2 .

It is a cyclic number.

It is not a de Polignac number, because 616240921 - 2¹¹ = 616238873 is a prime.

It is not a weakly prime, because it can be changed into another prime (616240951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308120460 + 308120461.

It is an arithmetic number, because the mean of its divisors is an integer number (308120461).

Almost surely, 2^616240921 is an apocalyptic number.

It is an amenable number.

616240921 is a deficient number, since it is larger than the sum of its proper divisors (1).

616240921 is an equidigital number, since it uses as much as digits as its factorization.

616240921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 616240921 is about 24824.2003093755. The cubic root of 616240921 is about 850.9750844564.

The spelling of 616240921 in words is "six hundred sixteen million, two hundred forty thousand, nine hundred twenty-one".