31162231 has 2 divisors, whose sum is σ = 31162232. Its totient is φ = 31162230.

The previous prime is 31162213. The next prime is 31162249. The reversal of 31162231 is 13226113.

Together with previous prime (31162213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (31162213) and next prime (31162249).

It is a cyclic number.

It is not a de Polignac number, because 31162231 - 2⁵ = 31162199 is a prime.

It is a super-2 number, since 2×31162231² = 1942169281794722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31162199 and 31162208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31162291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15581115 + 15581116.

It is an arithmetic number, because the mean of its divisors is an integer number (15581116).

Almost surely, 2^31162231 is an apocalyptic number.

31162231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31162231 is an equidigital number, since it uses as much as digits as its factorization.

31162231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 19.

The square root of 31162231 is about 5582.3141258801. The cubic root of 31162231 is about 314.6851006080.

Adding to 31162231 its reverse (13226113), we get a palindrome (44388344).

The spelling of 31162231 in words is "thirty-one million, one hundred sixty-two thousand, two hundred thirty-one".