15684241 has 2 divisors, whose sum is σ = 15684242. Its totient is φ = 15684240.

The previous prime is 15684239. The next prime is 15684281. The reversal of 15684241 is 14248651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12780625 + 2903616 = 3575^2 + 1704^2 .

It is a cyclic number.

It is not a de Polignac number, because 15684241 - 2¹ = 15684239 is a prime.

Together with 15684239, 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 (15684281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7842120 + 7842121.

It is an arithmetic number, because the mean of its divisors is an integer number (7842121).

Almost surely, 2^15684241 is an apocalyptic number.

It is an amenable number.

15684241 is a deficient number, since it is larger than the sum of its proper divisors (1).

15684241 is an equidigital number, since it uses as much as digits as its factorization.

15684241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 31.

The square root of 15684241 is about 3960.3334455573. Note that the first 3 decimals coincide. The cubic root of 15684241 is about 250.3155535363.

The spelling of 15684241 in words is "fifteen million, six hundred eighty-four thousand, two hundred forty-one".