31132231 has 4 divisors (see below), whose sum is σ = 33527032. Its totient is φ = 28737432.

The previous prime is 31132229. The next prime is 31132249. The reversal of 31132231 is 13223113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13223113 = 127 ⋅104119.

It is a cyclic number.

It is not a de Polignac number, because 31132231 - 2¹ = 31132229 is a prime.

It is a super-2 number, since 2×31132231² = 1938431614074722, 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 (31132201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1197381 + ... + 1197406.

It is an arithmetic number, because the mean of its divisors is an integer number (8381758).

Almost surely, 2^31132231 is an apocalyptic number.

31132231 is a deficient number, since it is larger than the sum of its proper divisors (2394801).

31132231 is a wasteful number, since it uses less digits than its factorization.

31132231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2394800.

The product of its digits is 108, while the sum is 16.

The square root of 31132231 is about 5579.6264211863. The cubic root of 31132231 is about 314.5840853317.

Adding to 31132231 its reverse (13223113), we get a palindrome (44355344).

The spelling of 31132231 in words is "thirty-one million, one hundred thirty-two thousand, two hundred thirty-one".