42812031 has 4 divisors (see below), whose sum is σ = 57082712. Its totient is φ = 28541352.

The previous prime is 42812027. The next prime is 42812041. The reversal of 42812031 is 13021824.

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

It is not a de Polignac number, because 42812031 - 2² = 42812027 is a prime.

It is a super-2 number, since 2×42812031² = 3665739996689922, 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 = 42811989 and 42812007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42812041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7135336 + ... + 7135341.

It is an arithmetic number, because the mean of its divisors is an integer number (14270678).

Almost surely, 2^42812031 is an apocalyptic number.

42812031 is a deficient number, since it is larger than the sum of its proper divisors (14270681).

42812031 is a wasteful number, since it uses less digits than its factorization.

42812031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14270680.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 42812031 is about 6543.0903249153. The cubic root of 42812031 is about 349.8285718314.

Adding to 42812031 its reverse (13021824), we get a palindrome (55833855).

The spelling of 42812031 in words is "forty-two million, eight hundred twelve thousand, thirty-one".