121636447 has 2 divisors, whose sum is σ = 121636448. Its totient is φ = 121636446.

The previous prime is 121636429. The next prime is 121636481. The reversal of 121636447 is 744636121.

It is an a-pointer prime, because the next prime (121636481) can be obtained adding 121636447 to its sum of digits (34).

It is a weak prime.

It is an emirp because it is prime and its reverse (744636121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121636447 - 2¹¹ = 121634399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121636247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60818223 + 60818224.

It is an arithmetic number, because the mean of its divisors is an integer number (60818224).

Almost surely, 2^121636447 is an apocalyptic number.

121636447 is a deficient number, since it is larger than the sum of its proper divisors (1).

121636447 is an equidigital number, since it uses as much as digits as its factorization.

121636447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 34.

The square root of 121636447 is about 11028.8914674141. The cubic root of 121636447 is about 495.4744245844.

The spelling of 121636447 in words is "one hundred twenty-one million, six hundred thirty-six thousand, four hundred forty-seven".