121456661 has 2 divisors, whose sum is σ = 121456662. Its totient is φ = 121456660.

The previous prime is 121456651. The next prime is 121456697. The reversal of 121456661 is 166654121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114618436 + 6838225 = 10706^2 + 2615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121456661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121456631) 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, 60728330 + 60728331.

It is an arithmetic number, because the mean of its divisors is an integer number (60728331).

Almost surely, 2^121456661 is an apocalyptic number.

It is an amenable number.

121456661 is a deficient number, since it is larger than the sum of its proper divisors (1).

121456661 is an equidigital number, since it uses as much as digits as its factorization.

121456661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 32.

The square root of 121456661 is about 11020.7377702221. The cubic root of 121456661 is about 495.2301905263.

It can be divided in two parts, 1214 and 56661, that added together give a palindrome (57875).

The spelling of 121456661 in words is "one hundred twenty-one million, four hundred fifty-six thousand, six hundred sixty-one".