616822729 has 2 divisors, whose sum is σ = 616822730. Its totient is φ = 616822728.

The previous prime is 616822727. The next prime is 616822733. The reversal of 616822729 is 927228616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 390260025 + 226562704 = 19755^2 + 15052^2 .

It is a cyclic number.

It is not a de Polignac number, because 616822729 - 2¹ = 616822727 is a prime.

It is a super-2 number, since 2×616822729² = 760940558022014882, which contains 22 as substring.

Together with 616822727, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (616822727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308411364 + 308411365.

It is an arithmetic number, because the mean of its divisors is an integer number (308411365).

Almost surely, 2^616822729 is an apocalyptic number.

It is an amenable number.

616822729 is a deficient number, since it is larger than the sum of its proper divisors (1).

616822729 is an equidigital number, since it uses as much as digits as its factorization.

616822729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 43.

The square root of 616822729 is about 24835.9161095378. The cubic root of 616822729 is about 851.2428089580.

The spelling of 616822729 in words is "six hundred sixteen million, eight hundred twenty-two thousand, seven hundred twenty-nine".