461549781 has 72 divisors (see below), whose sum is σ = 844526592. Its totient is φ = 237758400.

The previous prime is 461549749. The next prime is 461549789. The reversal of 461549781 is 187945164.

It is not a de Polignac number, because 461549781 - 2⁵ = 461549749 is a prime.

It is a super-2 number, since 2×461549781² = 426056400682295922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (461549789) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1455835 + ... + 1456151.

It is an arithmetic number, because the mean of its divisors is an integer number (11729536).

Almost surely, 2^461549781 is an apocalyptic number.

It is an amenable number.

461549781 is a deficient number, since it is larger than the sum of its proper divisors (382976811).

461549781 is a wasteful number, since it uses less digits than its factorization.

461549781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543 (or 529 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 461549781 is about 21483.7096656979. The cubic root of 461549781 is about 772.8102075234.

The spelling of 461549781 in words is "four hundred sixty-one million, five hundred forty-nine thousand, seven hundred eighty-one".