42491931 has 16 divisors (see below), whose sum is σ = 58786560. Its totient is φ = 27268640.

The previous prime is 42491927. The next prime is 42492019. The reversal of 42491931 is 13919424.

It is a cyclic number.

It is not a de Polignac number, because 42491931 - 2² = 42491927 is a prime.

It is a super-2 number, since 2×42491931² = 3611128400217522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42491892 and 42491901.

It is not an unprimeable number, because it can be changed into a prime (42491921) 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, 43276 + ... + 44246.

It is an arithmetic number, because the mean of its divisors is an integer number (3674160).

Almost surely, 2^42491931 is an apocalyptic number.

42491931 is a deficient number, since it is larger than the sum of its proper divisors (16294629).

42491931 is a wasteful number, since it uses less digits than its factorization.

42491931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506.

The product of its digits is 7776, while the sum is 33.

The square root of 42491931 is about 6518.5835117762. The cubic root of 42491931 is about 348.9545155185.

The spelling of 42491931 in words is "forty-two million, four hundred ninety-one thousand, nine hundred thirty-one".