121517647 has 2 divisors, whose sum is σ = 121517648. Its totient is φ = 121517646.

The previous prime is 121517611. The next prime is 121517651. The reversal of 121517647 is 746715121.

It is a strong prime.

It is an emirp because it is prime and its reverse (746715121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121517647 - 2¹⁹ = 120993359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121517687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60758823 + 60758824.

It is an arithmetic number, because the mean of its divisors is an integer number (60758824).

Almost surely, 2^121517647 is an apocalyptic number.

121517647 is a deficient number, since it is larger than the sum of its proper divisors (1).

121517647 is an equidigital number, since it uses as much as digits as its factorization.

121517647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 34.

The square root of 121517647 is about 11023.5042976360. The cubic root of 121517647 is about 495.3130652310.

The spelling of 121517647 in words is "one hundred twenty-one million, five hundred seventeen thousand, six hundred forty-seven".