121697309 has 2 divisors, whose sum is σ = 121697310. Its totient is φ = 121697308.

The previous prime is 121697291. The next prime is 121697327. The reversal of 121697309 is 903796121.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (121697291) and next prime (121697327).

It can be written as a sum of positive squares in only one way, i.e., 67601284 + 54096025 = 8222^2 + 7355^2 .

It is a cyclic number.

It is not a de Polignac number, because 121697309 - 2¹² = 121693213 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 (121697399) 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, 60848654 + 60848655.

It is an arithmetic number, because the mean of its divisors is an integer number (60848655).

Almost surely, 2^121697309 is an apocalyptic number.

It is an amenable number.

121697309 is a deficient number, since it is larger than the sum of its proper divisors (1).

121697309 is an equidigital number, since it uses as much as digits as its factorization.

121697309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 121697309 is about 11031.6503298464. The cubic root of 121697309 is about 495.5570493158.

The spelling of 121697309 in words is "one hundred twenty-one million, six hundred ninety-seven thousand, three hundred nine".