121965647 has 2 divisors, whose sum is σ = 121965648. Its totient is φ = 121965646.

The previous prime is 121965637. The next prime is 121965703. The reversal of 121965647 is 746569121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121965647 - 2⁴ = 121965631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121965637) 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, 60982823 + 60982824.

It is an arithmetic number, because the mean of its divisors is an integer number (60982824).

Almost surely, 2^121965647 is an apocalyptic number.

121965647 is a deficient number, since it is larger than the sum of its proper divisors (1).

121965647 is an equidigital number, since it uses as much as digits as its factorization.

121965647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 121965647 is about 11043.8058204588. The cubic root of 121965647 is about 495.9210101732.

It can be divided in two parts, 1219 and 65647, that added together give a palindrome (66866).

The spelling of 121965647 in words is "one hundred twenty-one million, nine hundred sixty-five thousand, six hundred forty-seven".