461872781 has 2 divisors, whose sum is σ = 461872782. Its totient is φ = 461872780.

The previous prime is 461872769. The next prime is 461872811. The reversal of 461872781 is 187278164.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 248566756 + 213306025 = 15766^2 + 14605^2 .

It is a cyclic number.

It is not a de Polignac number, because 461872781 - 2⁶ = 461872717 is a prime.

It is a super-3 number, since 3×461872781³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (461872181) 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 as a sum of consecutive naturals, namely, 230936390 + 230936391.

It is an arithmetic number, because the mean of its divisors is an integer number (230936391).

Almost surely, 2^461872781 is an apocalyptic number.

It is an amenable number.

461872781 is a deficient number, since it is larger than the sum of its proper divisors (1).

461872781 is an equidigital number, since it uses as much as digits as its factorization.

461872781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 150528, while the sum is 44.

The square root of 461872781 is about 21491.2256746794. The cubic root of 461872781 is about 772.9904405131.

The spelling of 461872781 in words is "four hundred sixty-one million, eight hundred seventy-two thousand, seven hundred eighty-one".