121984657 has 2 divisors, whose sum is σ = 121984658. Its totient is φ = 121984656.

The previous prime is 121984631. The next prime is 121984691. The reversal of 121984657 is 756489121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107246736 + 14737921 = 10356^2 + 3839^2 .

It is a cyclic number.

It is not a de Polignac number, because 121984657 - 2⁷ = 121984529 is a prime.

It is not a weakly prime, because it can be changed into another prime (121984607) 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, 60992328 + 60992329.

It is an arithmetic number, because the mean of its divisors is an integer number (60992329).

Almost surely, 2^121984657 is an apocalyptic number.

It is an amenable number.

121984657 is a deficient number, since it is larger than the sum of its proper divisors (1).

121984657 is an equidigital number, since it uses as much as digits as its factorization.

121984657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 43.

The square root of 121984657 is about 11044.6664503732. Note that the first 3 decimals coincide. The cubic root of 121984657 is about 495.9467741728.

The spelling of 121984657 in words is "one hundred twenty-one million, nine hundred eighty-four thousand, six hundred fifty-seven".