616546621 has 2 divisors, whose sum is σ = 616546622. Its totient is φ = 616546620.

The previous prime is 616546613. The next prime is 616546657. The reversal of 616546621 is 126645616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 373030596 + 243516025 = 19314^2 + 15605^2 .

It is a cyclic number.

It is not a de Polignac number, because 616546621 - 2³ = 616546613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616546661) 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, 308273310 + 308273311.

It is an arithmetic number, because the mean of its divisors is an integer number (308273311).

Almost surely, 2^616546621 is an apocalyptic number.

It is an amenable number.

616546621 is a deficient number, since it is larger than the sum of its proper divisors (1).

616546621 is an equidigital number, since it uses as much as digits as its factorization.

616546621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 37.

The square root of 616546621 is about 24830.3568439924. The cubic root of 616546621 is about 851.1157762268.

The spelling of 616546621 in words is "six hundred sixteen million, five hundred forty-six thousand, six hundred twenty-one".