121967581 has 2 divisors, whose sum is σ = 121967582. Its totient is φ = 121967580.

The previous prime is 121967569. The next prime is 121967603. The reversal of 121967581 is 185769121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76405081 + 45562500 = 8741^2 + 6750^2 .

It is a cyclic number.

It is not a de Polignac number, because 121967581 - 2⁷ = 121967453 is a prime.

It is a super-2 number, since 2×121967581² = 29752181629983122, which contains 22 as substring.

It is a Chen prime.

It is equal to p_6947275 and since 121967581 and 6947275 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121967561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60983790 + 60983791.

It is an arithmetic number, because the mean of its divisors is an integer number (60983791).

Almost surely, 2^121967581 is an apocalyptic number.

It is an amenable number.

121967581 is a deficient number, since it is larger than the sum of its proper divisors (1).

121967581 is an equidigital number, since it uses as much as digits as its factorization.

121967581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 40.

The square root of 121967581 is about 11043.8933805067. The cubic root of 121967581 is about 495.9236314199.

The spelling of 121967581 in words is "one hundred twenty-one million, nine hundred sixty-seven thousand, five hundred eighty-one".