461785981 has 4 divisors (see below), whose sum is σ = 463109500. Its totient is φ = 460462464.

The previous prime is 461785969. The next prime is 461785997. The reversal of 461785981 is 189587164.

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 185096025 + 276689956 = 13605^2 + 16634^2 .

It is a cyclic number.

It is not a de Polignac number, because 461785981 - 2¹⁹ = 461261693 is a prime.

It is a super-2 number, since 2×461785981² = 426492584496264722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (461785381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661236 + ... + 661933.

It is an arithmetic number, because the mean of its divisors is an integer number (115777375).

Almost surely, 2^461785981 is an apocalyptic number.

It is an amenable number.

461785981 is a deficient number, since it is larger than the sum of its proper divisors (1323519).

461785981 is a wasteful number, since it uses less digits than its factorization.

461785981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1323518.

The product of its digits is 483840, while the sum is 49.

The square root of 461785981 is about 21489.2061509959. The cubic root of 461785981 is about 772.9420146431.

The spelling of 461785981 in words is "four hundred sixty-one million, seven hundred eighty-five thousand, nine hundred eighty-one".