461491931 has 6 divisors (see below), whose sum is σ = 487059732. Its totient is φ = 437202540.

The previous prime is 461491903. The next prime is 461491973. The reversal of 461491931 is 139194164.

It is not a de Polignac number, because 461491931 - 2¹⁰ = 461490907 is a prime.

It is a super-2 number, since 2×461491931² = 425949604756217522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (461491981) 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 5 ways as a sum of consecutive naturals, for example, 638825 + ... + 639546.

It is an arithmetic number, because the mean of its divisors is an integer number (81176622).

Almost surely, 2^461491931 is an apocalyptic number.

461491931 is a deficient number, since it is larger than the sum of its proper divisors (25567801).

461491931 is a wasteful number, since it uses less digits than its factorization.

461491931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278409 (or 1278390 counting only the distinct ones).

The product of its digits is 23328, while the sum is 38.

The square root of 461491931 is about 21482.3632545398. The cubic root of 461491931 is about 772.7779185264. Note that the first 3 decimals are identical.

The spelling of 461491931 in words is "four hundred sixty-one million, four hundred ninety-one thousand, nine hundred thirty-one".