40531231 has 4 divisors (see below), whose sum is σ = 43649032. Its totient is φ = 37413432.

The previous prime is 40531217. The next prime is 40531259. The reversal of 40531231 is 13213504.

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 40531231 - 2⁷ = 40531103 is a prime.

It is a super-2 number, since 2×40531231² = 3285561372750722, 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 = 40531199 and 40531208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40531331) 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, 1558881 + ... + 1558906.

It is an arithmetic number, because the mean of its divisors is an integer number (10912258).

Almost surely, 2^40531231 is an apocalyptic number.

40531231 is a deficient number, since it is larger than the sum of its proper divisors (3117801).

40531231 is a wasteful number, since it uses less digits than its factorization.

40531231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3117800.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 40531231 is about 6366.4142969178. The cubic root of 40531231 is about 343.5025230992.

Adding to 40531231 its reverse (13213504), we get a palindrome (53744735).

The spelling of 40531231 in words is "forty million, five hundred thirty-one thousand, two hundred thirty-one".