461661721 has 8 divisors (see below), whose sum is σ = 464405760. Its totient is φ = 458924928.

The previous prime is 461661719. The next prime is 461661743. The reversal of 461661721 is 127166164.

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

It is a cyclic number.

It is not a de Polignac number, because 461661721 - 2¹ = 461661719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (461161721) 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 7 ways as a sum of consecutive naturals, for example, 172425 + ... + 175081.

It is an arithmetic number, because the mean of its divisors is an integer number (58050720).

Almost surely, 2^461661721 is an apocalyptic number.

It is an amenable number.

461661721 is a deficient number, since it is larger than the sum of its proper divisors (2744039).

461661721 is a wasteful number, since it uses less digits than its factorization.

461661721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3623.

The product of its digits is 12096, while the sum is 34.

The square root of 461661721 is about 21486.3147375254. The cubic root of 461661721 is about 772.8726792115.

The spelling of 461661721 in words is "four hundred sixty-one million, six hundred sixty-one thousand, seven hundred twenty-one".