42550331 has 2 divisors, whose sum is σ = 42550332. Its totient is φ = 42550330.

The previous prime is 42550327. The next prime is 42550351. The reversal of 42550331 is 13305524.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42550331 - 2² = 42550327 is a prime.

It is a super-2 number, since 2×42550331² = 3621061336419122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42550297 and 42550306.

It is not a weakly prime, because it can be changed into another prime (42550351) 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 as a sum of consecutive naturals, namely, 21275165 + 21275166.

It is an arithmetic number, because the mean of its divisors is an integer number (21275166).

Almost surely, 2^42550331 is an apocalyptic number.

42550331 is a deficient number, since it is larger than the sum of its proper divisors (1).

42550331 is an equidigital number, since it uses as much as digits as its factorization.

42550331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 42550331 is about 6523.0614744919. The cubic root of 42550331 is about 349.1143075404.

Adding to 42550331 its reverse (13305524), we get a palindrome (55855855).

The spelling of 42550331 in words is "forty-two million, five hundred fifty thousand, three hundred thirty-one".