121661867 has 2 divisors, whose sum is σ = 121661868. Its totient is φ = 121661866.

The previous prime is 121661863. The next prime is 121661909. The reversal of 121661867 is 768166121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121661867 - 2² = 121661863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121661867.

It is not a weakly prime, because it can be changed into another prime (121661863) 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, 60830933 + 60830934.

It is an arithmetic number, because the mean of its divisors is an integer number (60830934).

Almost surely, 2^121661867 is an apocalyptic number.

121661867 is a deficient number, since it is larger than the sum of its proper divisors (1).

121661867 is an equidigital number, since it uses as much as digits as its factorization.

121661867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 38.

The square root of 121661867 is about 11030.0438349084. The cubic root of 121661867 is about 495.5089374926.

The spelling of 121661867 in words is "one hundred twenty-one million, six hundred sixty-one thousand, eight hundred sixty-seven".