461781 has 10 divisors (see below), whose sum is σ = 689942. Its totient is φ = 307800.

The previous prime is 461717. The next prime is 461801. The reversal of 461781 is 187164.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 443556 + 18225 = 666^2 + 135^2 .

It is not a de Polignac number, because 461781 - 2⁶ = 461717 is a prime.

It is a super-2 number, since 2×461781² = 426483383922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 461781.

It is not an unprimeable number, because it can be changed into a prime (461381) 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 9 ways as a sum of consecutive naturals, for example, 2770 + ... + 2931.

2⁴⁶¹⁷⁸¹ is an apocalyptic number.

It is an amenable number.

461781 is a deficient number, since it is larger than the sum of its proper divisors (228161).

461781 is an equidigital number, since it uses as much as digits as its factorization.

461781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5713 (or 5704 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 461781 is about 679.5447005165. The cubic root of 461781 is about 77.2939235550.

The spelling of 461781 in words is "four hundred sixty-one thousand, seven hundred eighty-one".