461731881 has 16 divisors (see below), whose sum is σ = 685863360. Its totient is φ = 274344000.

The previous prime is 461731871. The next prime is 461731909. The reversal of 461731881 is 188137164.

It is not a de Polignac number, because 461731881 - 2¹⁴ = 461715497 is a prime.

It is a super-2 number, since 2×461731881² = 426392659863596322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (461731841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202995 + ... + 205256.

It is an arithmetic number, because the mean of its divisors is an integer number (42866460).

Almost surely, 2^461731881 is an apocalyptic number.

It is an amenable number.

461731881 is a deficient number, since it is larger than the sum of its proper divisors (224131479).

461731881 is a wasteful number, since it uses less digits than its factorization.

461731881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408296.

The product of its digits is 32256, while the sum is 39.

The square root of 461731881 is about 21487.9473426384. The cubic root of 461731881 is about 772.9118290898.

The spelling of 461731881 in words is "four hundred sixty-one million, seven hundred thirty-one thousand, eight hundred eighty-one".