616129879 has 4 divisors (see below), whose sum is σ = 616376800. Its totient is φ = 615882960.

The previous prime is 616129799. The next prime is 616129889. The reversal of 616129879 is 978921616.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 616129879 - 2²⁵ = 582575447 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 (616129889) 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, 119679 + ... + 124720.

It is an arithmetic number, because the mean of its divisors is an integer number (154094200).

Almost surely, 2^616129879 is an apocalyptic number.

616129879 is a deficient number, since it is larger than the sum of its proper divisors (246921).

616129879 is a wasteful number, since it uses less digits than its factorization.

616129879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246920.

The product of its digits is 326592, while the sum is 49.

The square root of 616129879 is about 24821.9636410982. The cubic root of 616129879 is about 850.9239682731.

The spelling of 616129879 in words is "six hundred sixteen million, one hundred twenty-nine thousand, eight hundred seventy-nine".