461981 has 4 divisors (see below), whose sum is σ = 497532. Its totient is φ = 426432.

The previous prime is 461977. The next prime is 461983. The reversal of 461981 is 189164.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 220900 + 241081 = 470^2 + 491^2 .

It is a cyclic number.

It is not a de Polignac number, because 461981 - 2² = 461977 is a prime.

It is a super-2 number, since 2×461981² = 426852888722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon 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 461981.

It is not an unprimeable number, because it can be changed into a prime (461983) 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, 17756 + ... + 17781.

It is an arithmetic number, because the mean of its divisors is an integer number (124383).

2⁴⁶¹⁹⁸¹ is an apocalyptic number.

It is an amenable number.

461981 is a deficient number, since it is larger than the sum of its proper divisors (35551).

461981 is a wasteful number, since it uses less digits than its factorization.

461981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35550.

The product of its digits is 1728, while the sum is 29.

The square root of 461981 is about 679.6918419402. The cubic root of 461981 is about 77.3050807583.

The spelling of 461981 in words is "four hundred sixty-one thousand, nine hundred eighty-one".