461979841891 has 4 divisors (see below), whose sum is σ = 469553281984. Its totient is φ = 454406401800.

The previous prime is 461979841871. The next prime is 461979841913. The reversal of 461979841891 is 198148979164.

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 461979841891 - 2²³ = 461971453283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (461979841871) 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, 3786719955 + ... + 3786720076.

It is an arithmetic number, because the mean of its divisors is an integer number (117388320496).

Almost surely, 2^461979841891 is an apocalyptic number.

461979841891 is a deficient number, since it is larger than the sum of its proper divisors (7573440093).

461979841891 is an equidigital number, since it uses as much as digits as its factorization.

461979841891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7573440092.

The product of its digits is 31352832, while the sum is 67.

The spelling of 461979841891 in words is "four hundred sixty-one billion, nine hundred seventy-nine million, eight hundred forty-one thousand, eight hundred ninety-one".