616139813 has 4 divisors (see below), whose sum is σ = 616862988. Its totient is φ = 615416640.

The previous prime is 616139803. The next prime is 616139863. The reversal of 616139813 is 318931616.

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 86081284 + 530058529 = 9278^2 + 23023^2 .

It is a cyclic number.

It is not a de Polignac number, because 616139813 - 2¹⁴ = 616123429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616139803) 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, 360308 + ... + 362013.

It is an arithmetic number, because the mean of its divisors is an integer number (154215747).

Almost surely, 2^616139813 is an apocalyptic number.

It is an amenable number.

616139813 is a deficient number, since it is larger than the sum of its proper divisors (723175).

616139813 is an equidigital number, since it uses as much as digits as its factorization.

616139813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723174.

The product of its digits is 23328, while the sum is 38.

The square root of 616139813 is about 24822.1637453305. The cubic root of 616139813 is about 850.9285414611.

The spelling of 616139813 in words is "six hundred sixteen million, one hundred thirty-nine thousand, eight hundred thirteen".