42055231 has 2 divisors, whose sum is σ = 42055232. Its totient is φ = 42055230.

The previous prime is 42055219. The next prime is 42055253. The reversal of 42055231 is 13255024.

It is an a-pointer prime, because the next prime (42055253) can be obtained adding 42055231 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42055231 - 2⁷ = 42055103 is a prime.

It is a super-2 number, since 2×42055231² = 3537284908926722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42055261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21027615 + 21027616.

It is an arithmetic number, because the mean of its divisors is an integer number (21027616).

Almost surely, 2^42055231 is an apocalyptic number.

42055231 is a deficient number, since it is larger than the sum of its proper divisors (1).

42055231 is an equidigital number, since it uses as much as digits as its factorization.

42055231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 42055231 is about 6485.0004626060. Note that the first 3 decimals coincide. The cubic root of 42055231 is about 347.7549663413.

The spelling of 42055231 in words is "forty-two million, fifty-five thousand, two hundred thirty-one".