42206231 has 4 divisors (see below), whose sum is σ = 42442200. Its totient is φ = 41970264.

The previous prime is 42206209. The next prime is 42206249. The reversal of 42206231 is 13260224.

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

It is a cyclic number.

It is not a de Polignac number, because 42206231 - 2¹⁸ = 41944087 is a prime.

It is a super-2 number, since 2×42206231² = 3562731870450722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42206251) 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, 117716 + ... + 118073.

It is an arithmetic number, because the mean of its divisors is an integer number (10610550).

Almost surely, 2^42206231 is an apocalyptic number.

42206231 is a deficient number, since it is larger than the sum of its proper divisors (235969).

42206231 is a wasteful number, since it uses less digits than its factorization.

42206231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235968.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 42206231 is about 6496.6322814209. The cubic root of 42206231 is about 348.1706758463.

Adding to 42206231 its reverse (13260224), we get a palindrome (55466455).

The spelling of 42206231 in words is "forty-two million, two hundred six thousand, two hundred thirty-one".