31143241 has 2 divisors, whose sum is σ = 31143242. Its totient is φ = 31143240.

The previous prime is 31143239. The next prime is 31143257. The reversal of 31143241 is 14234113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28515600 + 2627641 = 5340^2 + 1621^2 .

It is an emirp because it is prime and its reverse (14234113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31143241 - 2¹ = 31143239 is a prime.

Together with 31143239, 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 (31143271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15571620 + 15571621.

It is an arithmetic number, because the mean of its divisors is an integer number (15571621).

Almost surely, 2^31143241 is an apocalyptic number.

It is an amenable number.

31143241 is a deficient number, since it is larger than the sum of its proper divisors (1).

31143241 is an equidigital number, since it uses as much as digits as its factorization.

31143241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 19.

The square root of 31143241 is about 5580.6129591650. The cubic root of 31143241 is about 314.6211654728.

Adding to 31143241 its reverse (14234113), we get a palindrome (45377354).

The spelling of 31143241 in words is "thirty-one million, one hundred forty-three thousand, two hundred forty-one".