616136809 has 4 divisors (see below), whose sum is σ = 630465616. Its totient is φ = 601808004.

The previous prime is 616136761. The next prime is 616136861. The reversal of 616136809 is 908631616.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 616136809 - 2²⁹ = 79265897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616131809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7164339 + ... + 7164424.

It is an arithmetic number, because the mean of its divisors is an integer number (157616404).

Almost surely, 2^616136809 is an apocalyptic number.

It is an amenable number.

616136809 is a deficient number, since it is larger than the sum of its proper divisors (14328807).

616136809 is a wasteful number, since it uses less digits than its factorization.

616136809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14328806.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 616136809 is about 24822.1032348188. The cubic root of 616136809 is about 850.9271585534.

The spelling of 616136809 in words is "six hundred sixteen million, one hundred thirty-six thousand, eight hundred nine".