42116731 has 4 divisors (see below), whose sum is σ = 42352200. Its totient is φ = 41881264.

The previous prime is 42116687. The next prime is 42116743. The reversal of 42116731 is 13761124.

42116731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42116731 - 2⁹ = 42116219 is a prime.

It is a super-2 number, since 2×42116731² = 3547638060252722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42116696 and 42116705.

It is not an unprimeable number, because it can be changed into a prime (42117731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117466 + ... + 117823.

It is an arithmetic number, because the mean of its divisors is an integer number (10588050).

Almost surely, 2^42116731 is an apocalyptic number.

42116731 is a deficient number, since it is larger than the sum of its proper divisors (235469).

42116731 is a wasteful number, since it uses less digits than its factorization.

42116731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235468.

The product of its digits is 1008, while the sum is 25.

The square root of 42116731 is about 6489.7404416510. The cubic root of 42116731 is about 347.9243984051.

Adding to 42116731 its reverse (13761124), we get a palindrome (55877855).

The spelling of 42116731 in words is "forty-two million, one hundred sixteen thousand, seven hundred thirty-one".