31223141 has 2 divisors, whose sum is σ = 31223142. Its totient is φ = 31223140.

The previous prime is 31223131. The next prime is 31223161. The reversal of 31223141 is 14132213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30360100 + 863041 = 5510^2 + 929^2 .

It is an emirp because it is prime and its reverse (14132213) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31223141 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31223131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15611570 + 15611571.

It is an arithmetic number, because the mean of its divisors is an integer number (15611571).

Almost surely, 2^31223141 is an apocalyptic number.

It is an amenable number.

31223141 is a deficient number, since it is larger than the sum of its proper divisors (1).

31223141 is an equidigital number, since it uses as much as digits as its factorization.

31223141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 17.

The square root of 31223141 is about 5587.7670853392. The cubic root of 31223141 is about 314.8899960225.

Adding to 31223141 its reverse (14132213), we get a palindrome (45355354).

The spelling of 31223141 in words is "thirty-one million, two hundred twenty-three thousand, one hundred forty-one".