121662601 has 2 divisors, whose sum is σ = 121662602. Its totient is φ = 121662600.

The previous prime is 121662599. The next prime is 121662637. The reversal of 121662601 is 106266121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104448400 + 17214201 = 10220^2 + 4149^2 .

It is a cyclic number.

It is not a de Polignac number, because 121662601 - 2¹ = 121662599 is a prime.

Together with 121662599, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (121662701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60831300 + 60831301.

It is an arithmetic number, because the mean of its divisors is an integer number (60831301).

Almost surely, 2^121662601 is an apocalyptic number.

It is an amenable number.

121662601 is a deficient number, since it is larger than the sum of its proper divisors (1).

121662601 is an equidigital number, since it uses as much as digits as its factorization.

121662601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 121662601 is about 11030.0771076181. The cubic root of 121662601 is about 495.5099339780.

The spelling of 121662601 in words is "one hundred twenty-one million, six hundred sixty-two thousand, six hundred one".