121686247 has 2 divisors, whose sum is σ = 121686248. Its totient is φ = 121686246.

The previous prime is 121686223. The next prime is 121686329. The reversal of 121686247 is 742686121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121686247 - 2¹⁹ = 121161959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121686847) 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, 60843123 + 60843124.

It is an arithmetic number, because the mean of its divisors is an integer number (60843124).

Almost surely, 2^121686247 is an apocalyptic number.

121686247 is a deficient number, since it is larger than the sum of its proper divisors (1).

121686247 is an equidigital number, since it uses as much as digits as its factorization.

121686247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 121686247 is about 11031.1489428799. The cubic root of 121686247 is about 495.5420338696.

The spelling of 121686247 in words is "one hundred twenty-one million, six hundred eighty-six thousand, two hundred forty-seven".