121666997 has 2 divisors, whose sum is σ = 121666998. Its totient is φ = 121666996.

The previous prime is 121666957. The next prime is 121667017. The reversal of 121666997 is 799666121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121308196 + 358801 = 11014^2 + 599^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121666997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121666907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60833498 + 60833499.

It is an arithmetic number, because the mean of its divisors is an integer number (60833499).

Almost surely, 2^121666997 is an apocalyptic number.

It is an amenable number.

121666997 is a deficient number, since it is larger than the sum of its proper divisors (1).

121666997 is an equidigital number, since it uses as much as digits as its factorization.

121666997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 47.

The square root of 121666997 is about 11030.2763791303. The cubic root of 121666997 is about 495.5159019458.

The spelling of 121666997 in words is "one hundred twenty-one million, six hundred sixty-six thousand, nine hundred ninety-seven".