6117861821 has 4 divisors (see below), whose sum is σ = 6152040000. Its totient is φ = 6083683644.

The previous prime is 6117861817. The next prime is 6117861823. The reversal of 6117861821 is 1281687116.

6117861821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 6117861821 - 2² = 6117861817 is a prime.

It is a super-5 number, since 5×6117861821⁵ (a number of 50 digits) contains 55555 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6117861823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17088821 + ... + 17089178.

It is an arithmetic number, because the mean of its divisors is an integer number (1538010000).

Almost surely, 2^6117861821 is an apocalyptic number.

It is an amenable number.

6117861821 is a deficient number, since it is larger than the sum of its proper divisors (34178179).

6117861821 is a wasteful number, since it uses less digits than its factorization.

6117861821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34178178.

The product of its digits is 32256, while the sum is 41.

The square root of 6117861821 is about 78216.7617649823. The cubic root of 6117861821 is about 1828.9418092170.

The spelling of 6117861821 in words is "six billion, one hundred seventeen million, eight hundred sixty-one thousand, eight hundred twenty-one".