31672231 has 2 divisors, whose sum is σ = 31672232. Its totient is φ = 31672230.

The previous prime is 31672229. The next prime is 31672253. The reversal of 31672231 is 13227613.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31672231 - 2¹ = 31672229 is a prime.

It is a super-2 number, since 2×31672231² = 2006260433034722, which contains 22 as substring.

Together with 31672229, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 31672196 and 31672205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31672211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15836115 + 15836116.

It is an arithmetic number, because the mean of its divisors is an integer number (15836116).

Almost surely, 2^31672231 is an apocalyptic number.

31672231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31672231 is an equidigital number, since it uses as much as digits as its factorization.

31672231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 25.

The square root of 31672231 is about 5627.8087209855. The cubic root of 31672231 is about 316.3925281514.

Adding to 31672231 its reverse (13227613), we get a palindrome (44899844).

The spelling of 31672231 in words is "thirty-one million, six hundred seventy-two thousand, two hundred thirty-one".