121774661 has 2 divisors, whose sum is σ = 121774662. Its totient is φ = 121774660.

The previous prime is 121774651. The next prime is 121774669. The reversal of 121774661 is 166477121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78872161 + 42902500 = 8881^2 + 6550^2 .

It is a cyclic number.

It is not a de Polignac number, because 121774661 - 2¹⁰ = 121773637 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121774669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60887330 + 60887331.

It is an arithmetic number, because the mean of its divisors is an integer number (60887331).

Almost surely, 2^121774661 is an apocalyptic number.

It is an amenable number.

121774661 is a deficient number, since it is larger than the sum of its proper divisors (1).

121774661 is an equidigital number, since it uses as much as digits as its factorization.

121774661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 35.

The square root of 121774661 is about 11035.1556853540. The cubic root of 121774661 is about 495.6620207146.

The spelling of 121774661 in words is "one hundred twenty-one million, seven hundred seventy-four thousand, six hundred sixty-one".