461819891 has 8 divisors (see below), whose sum is σ = 497629104. Its totient is φ = 426051360.

The previous prime is 461819887. The next prime is 461819993. The reversal of 461819891 is 198918164.

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 461819891 - 2² = 461819887 is a prime.

It is a super-2 number, since 2×461819891² = 426555223446503762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (461819851) 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 7 ways as a sum of consecutive naturals, for example, 15905 + ... + 34301.

It is an arithmetic number, because the mean of its divisors is an integer number (62203638).

Almost surely, 2^461819891 is an apocalyptic number.

461819891 is a deficient number, since it is larger than the sum of its proper divisors (35809213).

461819891 is a wasteful number, since it uses less digits than its factorization.

461819891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20341.

The product of its digits is 124416, while the sum is 47.

The square root of 461819891 is about 21489.9951372726. The cubic root of 461819891 is about 772.9609338129.

The spelling of 461819891 in words is "four hundred sixty-one million, eight hundred nineteen thousand, eight hundred ninety-one".