461878561 has 4 divisors (see below), whose sum is σ = 462235972. Its totient is φ = 461521152.

The previous prime is 461878537. The next prime is 461878567. The reversal of 461878561 is 165878164.

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 410670225 + 51208336 = 20265^2 + 7156^2 .

It is a cyclic number.

It is not a de Polignac number, because 461878561 - 2¹⁹ = 461354273 is a prime.

It is a super-2 number, since 2×461878561² = 426663610222861442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (461878567) 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, 176760 + ... + 179353.

It is an arithmetic number, because the mean of its divisors is an integer number (115558993).

Almost surely, 2^461878561 is an apocalyptic number.

It is an amenable number.

461878561 is a deficient number, since it is larger than the sum of its proper divisors (357411).

461878561 is a wasteful number, since it uses less digits than its factorization.

461878561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357410.

The product of its digits is 322560, while the sum is 46.

The square root of 461878561 is about 21491.3601477431. The cubic root of 461878561 is about 772.9936649696.

The spelling of 461878561 in words is "four hundred sixty-one million, eight hundred seventy-eight thousand, five hundred sixty-one".