461609999 has 4 divisors (see below), whose sum is σ = 461704440. Its totient is φ = 461515560.

The previous prime is 461609989. The next prime is 461610043. The reversal of 461609999 is 999906164.

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 461609999 - 2¹⁶ = 461544463 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 461609999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (461609909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39464 + ... + 49805.

It is an arithmetic number, because the mean of its divisors is an integer number (115426110).

Almost surely, 2^461609999 is an apocalyptic number.

461609999 is a deficient number, since it is larger than the sum of its proper divisors (94441).

461609999 is an equidigital number, since it uses as much as digits as its factorization.

461609999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94440.

The product of its (nonzero) digits is 944784, while the sum is 53.

The square root of 461609999 is about 21485.1111004807. Note that the first 4 decimals coincide. The cubic root of 461609999 is about 772.8438153545.

The spelling of 461609999 in words is "four hundred sixty-one million, six hundred nine thousand, nine hundred ninety-nine".