6161721 has 8 divisors (see below), whose sum is σ = 8437824. Its totient is φ = 3996720.

The previous prime is 6161693. The next prime is 6161761. The reversal of 6161721 is 1271616.

6161721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6161721 - 2⁹ = 6161209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6161691 and 6161700.

It is not an unprimeable number, because it can be changed into a prime (6161761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27645 + ... + 27866.

It is an arithmetic number, because the mean of its divisors is an integer number (1054728).

Almost surely, 2^6161721 is an apocalyptic number.

It is an amenable number.

6161721 is a deficient number, since it is larger than the sum of its proper divisors (2276103).

6161721 is a wasteful number, since it uses less digits than its factorization.

6161721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55551.

The product of its digits is 504, while the sum is 24.

The square root of 6161721 is about 2482.2814103159. The cubic root of 6161721 is about 183.3301990281.

The spelling of 6161721 in words is "six million, one hundred sixty-one thousand, seven hundred twenty-one".