42550031 has 4 divisors (see below), whose sum is σ = 45052992. Its totient is φ = 40047072.

The previous prime is 42550019. The next prime is 42550051. The reversal of 42550031 is 13005524.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42550031 is a prime.

It is a super-2 number, since 2×42550031² = 3621010276201922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42549985 and 42550012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42550051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1251455 + ... + 1251488.

It is an arithmetic number, because the mean of its divisors is an integer number (11263248).

Almost surely, 2^42550031 is an apocalyptic number.

42550031 is a deficient number, since it is larger than the sum of its proper divisors (2502961).

42550031 is a wasteful number, since it uses less digits than its factorization.

42550031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2502960.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 42550031 is about 6523.0384791139. The cubic root of 42550031 is about 349.1134870647.

Adding to 42550031 its reverse (13005524), we get a palindrome (55555555).

The spelling of 42550031 in words is "forty-two million, five hundred fifty thousand, thirty-one".