31231241 has 2 divisors, whose sum is σ = 31231242. Its totient is φ = 31231240.

The previous prime is 31231223. The next prime is 31231243. The reversal of 31231241 is 14213213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25452025 + 5779216 = 5045^2 + 2404^2 .

It is a cyclic number.

It is not a de Polignac number, because 31231241 - 2¹⁸ = 30969097 is a prime.

Together with 31231243, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31231243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615620 + 15615621.

It is an arithmetic number, because the mean of its divisors is an integer number (15615621).

Almost surely, 2^31231241 is an apocalyptic number.

It is an amenable number.

31231241 is a deficient number, since it is larger than the sum of its proper divisors (1).

31231241 is an equidigital number, since it uses as much as digits as its factorization.

31231241 is an evil number, because the sum of its binary digits is even.

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

The square root of 31231241 is about 5588.4918359071. The cubic root of 31231241 is about 314.9172235676.

Adding to 31231241 its reverse (14213213), we get a palindrome (45444454).

The spelling of 31231241 in words is "thirty-one million, two hundred thirty-one thousand, two hundred forty-one".