42312031 has 16 divisors (see below), whose sum is σ = 47662560. Its totient is φ = 37324800.

The previous prime is 42311999. The next prime is 42312037. The reversal of 42312031 is 13021324.

It is a happy number.

42312031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a 11-Lehmer number, since φ(42312031) divides (42312031-1)¹¹.

It is a cyclic number.

It is not a de Polignac number, because 42312031 - 2⁵ = 42311999 is a prime.

It is a super-2 number, since 2×42312031² = 3580615934689922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42311996 and 42312014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42312037) 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 15 ways as a sum of consecutive naturals, for example, 31975 + ... + 33271.

It is an arithmetic number, because the mean of its divisors is an integer number (2978910).

Almost surely, 2^42312031 is an apocalyptic number.

42312031 is a deficient number, since it is larger than the sum of its proper divisors (5350529).

42312031 is a wasteful number, since it uses less digits than its factorization.

42312031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 42312031 is about 6504.7698652604. The cubic root of 42312031 is about 348.4613574165.

Adding to 42312031 its reverse (13021324), we get a palindrome (55333355).

The spelling of 42312031 in words is "forty-two million, three hundred twelve thousand, thirty-one".