121665773 has 2 divisors, whose sum is σ = 121665774. Its totient is φ = 121665772.

The previous prime is 121665757. The next prime is 121665809. The reversal of 121665773 is 377566121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81685444 + 39980329 = 9038^2 + 6323^2 .

It is a cyclic number.

It is not a de Polignac number, because 121665773 - 2⁴ = 121665757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121665703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60832886 + 60832887.

It is an arithmetic number, because the mean of its divisors is an integer number (60832887).

Almost surely, 2^121665773 is an apocalyptic number.

It is an amenable number.

121665773 is a deficient number, since it is larger than the sum of its proper divisors (1).

121665773 is an equidigital number, since it uses as much as digits as its factorization.

121665773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 38.

The square root of 121665773 is about 11030.2208953402. The cubic root of 121665773 is about 495.5142402695.

The spelling of 121665773 in words is "one hundred twenty-one million, six hundred sixty-five thousand, seven hundred seventy-three".