121695851 has 2 divisors, whose sum is σ = 121695852. Its totient is φ = 121695850.

The previous prime is 121695811. The next prime is 121695853. The reversal of 121695851 is 158596121.

It is a strong prime.

It is an emirp because it is prime and its reverse (158596121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121695851 is a prime.

It is a super-2 number, since 2×121695851² = 29619760301228402, which contains 22 as substring.

Together with 121695853, 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 (121695853) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60847925 + 60847926.

It is an arithmetic number, because the mean of its divisors is an integer number (60847926).

Almost surely, 2^121695851 is an apocalyptic number.

121695851 is a deficient number, since it is larger than the sum of its proper divisors (1).

121695851 is an equidigital number, since it uses as much as digits as its factorization.

121695851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 38.

The square root of 121695851 is about 11031.5842470608. The cubic root of 121695851 is about 495.5550702935. Note that the first 3 decimals are identical.

The spelling of 121695851 in words is "one hundred twenty-one million, six hundred ninety-five thousand, eight hundred fifty-one".