42261231 has 4 divisors (see below), whose sum is σ = 56348312. Its totient is φ = 28174152.

The previous prime is 42261229. The next prime is 42261341. The reversal of 42261231 is 13216224.

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

It is not a de Polignac number, because 42261231 - 2¹ = 42261229 is a prime.

It is a super-2 number, since 2×42261231² = 3572023291270722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42261198 and 42261207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42261221) 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, 7043536 + ... + 7043541.

It is an arithmetic number, because the mean of its divisors is an integer number (14087078).

Almost surely, 2^42261231 is an apocalyptic number.

42261231 is a deficient number, since it is larger than the sum of its proper divisors (14087081).

42261231 is a wasteful number, since it uses less digits than its factorization.

42261231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14087080.

The product of its digits is 576, while the sum is 21.

The square root of 42261231 is about 6500.8638656720. The cubic root of 42261231 is about 348.3218468520.

Adding to 42261231 its reverse (13216224), we get a palindrome (55477455).

The spelling of 42261231 in words is "forty-two million, two hundred sixty-one thousand, two hundred thirty-one".