31920241 has 2 divisors, whose sum is σ = 31920242. Its totient is φ = 31920240.

The previous prime is 31920211. The next prime is 31920253. The reversal of 31920241 is 14202913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22896225 + 9024016 = 4785^2 + 3004^2 .

It is an emirp because it is prime and its reverse (14202913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31920241 - 2¹¹ = 31918193 is a prime.

It is not a weakly prime, because it can be changed into another prime (31920211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15960120 + 15960121.

It is an arithmetic number, because the mean of its divisors is an integer number (15960121).

Almost surely, 2^31920241 is an apocalyptic number.

It is an amenable number.

31920241 is a deficient number, since it is larger than the sum of its proper divisors (1).

31920241 is an equidigital number, since it uses as much as digits as its factorization.

31920241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 31920241 is about 5649.8000849588. The cubic root of 31920241 is about 317.2162211093.

The spelling of 31920241 in words is "thirty-one million, nine hundred twenty thousand, two hundred forty-one".