31140233 has 2 divisors, whose sum is σ = 31140234. Its totient is φ = 31140232.

The previous prime is 31140191. The next prime is 31140251. The reversal of 31140233 is 33204113.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25532809 + 5607424 = 5053^2 + 2368^2 .

It is an emirp because it is prime and its reverse (33204113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31140233 - 2¹⁶ = 31074697 is a prime.

It is a super-2 number, since 2×31140233² = 1939428222588578, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31140253) 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 as a sum of consecutive naturals, namely, 15570116 + 15570117.

It is an arithmetic number, because the mean of its divisors is an integer number (15570117).

Almost surely, 2^31140233 is an apocalyptic number.

It is an amenable number.

31140233 is a deficient number, since it is larger than the sum of its proper divisors (1).

31140233 is an equidigital number, since it uses as much as digits as its factorization.

31140233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 31140233 is about 5580.3434482118. The cubic root of 31140233 is about 314.6110358170.

Adding to 31140233 its reverse (33204113), we get a palindrome (64344346).

The spelling of 31140233 in words is "thirty-one million, one hundred forty thousand, two hundred thirty-three".