616505173 has 2 divisors, whose sum is σ = 616505174. Its totient is φ = 616505172.

The previous prime is 616505167. The next prime is 616505189. The reversal of 616505173 is 371505616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 531901969 + 84603204 = 23063^2 + 9198^2 .

It is a cyclic number.

It is not a de Polignac number, because 616505173 - 2¹³ = 616496981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616505143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308252586 + 308252587.

It is an arithmetic number, because the mean of its divisors is an integer number (308252587).

Almost surely, 2^616505173 is an apocalyptic number.

It is an amenable number.

616505173 is a deficient number, since it is larger than the sum of its proper divisors (1).

616505173 is an equidigital number, since it uses as much as digits as its factorization.

616505173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 616505173 is about 24829.5222064380. The cubic root of 616505173 is about 851.0967034127.

The spelling of 616505173 in words is "six hundred sixteen million, five hundred five thousand, one hundred seventy-three".