121690579 has 2 divisors, whose sum is σ = 121690580. Its totient is φ = 121690578.

The previous prime is 121690577. The next prime is 121690601. The reversal of 121690579 is 975096121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121690579 - 2¹ = 121690577 is a prime.

Together with 121690577, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121690571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60845289 + 60845290.

It is an arithmetic number, because the mean of its divisors is an integer number (60845290).

Almost surely, 2^121690579 is an apocalyptic number.

121690579 is a deficient number, since it is larger than the sum of its proper divisors (1).

121690579 is an equidigital number, since it uses as much as digits as its factorization.

121690579 is an evil number, because the sum of its binary digits is even.

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

The square root of 121690579 is about 11031.3452942060. The cubic root of 121690579 is about 495.5479141907.

The spelling of 121690579 in words is "one hundred twenty-one million, six hundred ninety thousand, five hundred seventy-nine".