121620689 has 2 divisors, whose sum is σ = 121620690. Its totient is φ = 121620688.

The previous prime is 121620683. The next prime is 121620713. The reversal of 121620689 is 986026121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120275089 + 1345600 = 10967^2 + 1160^2 .

It is a cyclic number.

It is not a de Polignac number, because 121620689 - 2⁴ = 121620673 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (121620683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60810344 + 60810345.

It is an arithmetic number, because the mean of its divisors is an integer number (60810345).

Almost surely, 2^121620689 is an apocalyptic number.

It is an amenable number.

121620689 is a deficient number, since it is larger than the sum of its proper divisors (1).

121620689 is an equidigital number, since it uses as much as digits as its factorization.

121620689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 121620689 is about 11028.1770479078. The cubic root of 121620689 is about 495.4530274254.

The spelling of 121620689 in words is "one hundred twenty-one million, six hundred twenty thousand, six hundred eighty-nine".