31123361 has 2 divisors, whose sum is σ = 31123362. Its totient is φ = 31123360.

The previous prime is 31123343. The next prime is 31123369. The reversal of 31123361 is 16332113.

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., 25150225 + 5973136 = 5015^2 + 2444^2 .

It is a cyclic number.

It is not a de Polignac number, because 31123361 - 2¹⁰ = 31122337 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31123369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561680 + 15561681.

It is an arithmetic number, because the mean of its divisors is an integer number (15561681).

Almost surely, 2^31123361 is an apocalyptic number.

It is an amenable number.

31123361 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123361 is an equidigital number, since it uses as much as digits as its factorization.

31123361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 20.

The square root of 31123361 is about 5578.8315084792. The cubic root of 31123361 is about 314.5542060523.

Adding to 31123361 its reverse (16332113), we get a palindrome (47455474).

The spelling of 31123361 in words is "thirty-one million, one hundred twenty-three thousand, three hundred sixty-one".