31324431 has 8 divisors (see below), whose sum is σ = 42554160. Its totient is φ = 20488832.

The previous prime is 31324417. The next prime is 31324439. The reversal of 31324431 is 13442313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31324431 - 2⁵ = 31324399 is a prime.

It is a super-2 number, since 2×31324431² = 1962439954947522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31324398 and 31324407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31324439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98346 + ... + 98663.

It is an arithmetic number, because the mean of its divisors is an integer number (5319270).

Almost surely, 2^31324431 is an apocalyptic number.

31324431 is a deficient number, since it is larger than the sum of its proper divisors (11229729).

31324431 is a wasteful number, since it uses less digits than its factorization.

31324431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197065.

The product of its digits is 864, while the sum is 21.

The square root of 31324431 is about 5596.8232954061. The cubic root of 31324431 is about 315.2301366856.

Adding to 31324431 its reverse (13442313), we get a palindrome (44766744).

The spelling of 31324431 in words is "thirty-one million, three hundred twenty-four thousand, four hundred thirty-one".