121669657 has 2 divisors, whose sum is σ = 121669658. Its totient is φ = 121669656.

The previous prime is 121669649. The next prime is 121669693. The reversal of 121669657 is 756966121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102799321 + 18870336 = 10139^2 + 4344^2 .

It is an emirp because it is prime and its reverse (756966121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121669657 - 2³ = 121669649 is a prime.

It is not a weakly prime, because it can be changed into another prime (121669607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60834828 + 60834829.

It is an arithmetic number, because the mean of its divisors is an integer number (60834829).

Almost surely, 2^121669657 is an apocalyptic number.

It is an amenable number.

121669657 is a deficient number, since it is larger than the sum of its proper divisors (1).

121669657 is an equidigital number, since it uses as much as digits as its factorization.

121669657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 43.

The square root of 121669657 is about 11030.3969556857. The cubic root of 121669657 is about 495.5195130666.

The spelling of 121669657 in words is "one hundred twenty-one million, six hundred sixty-nine thousand, six hundred fifty-seven".