121905697 has 2 divisors, whose sum is σ = 121905698. Its totient is φ = 121905696.

The previous prime is 121905683. The next prime is 121905737. The reversal of 121905697 is 796509121.

It is an a-pointer prime, because the next prime (121905737) can be obtained adding 121905697 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104939536 + 16966161 = 10244^2 + 4119^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121905697 is a prime.

It is a super-2 number, since 2×121905697² = 29721997922111618, which contains 22 as substring.

It is a Chen prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (121905607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60952848 + 60952849.

It is an arithmetic number, because the mean of its divisors is an integer number (60952849).

Almost surely, 2^121905697 is an apocalyptic number.

It is an amenable number.

121905697 is a deficient number, since it is larger than the sum of its proper divisors (1).

121905697 is an equidigital number, since it uses as much as digits as its factorization.

121905697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020, while the sum is 40.

The square root of 121905697 is about 11041.0912957008. The cubic root of 121905697 is about 495.8397431995.

The spelling of 121905697 in words is "one hundred twenty-one million, nine hundred five thousand, six hundred ninety-seven".