121891867 has 2 divisors, whose sum is σ = 121891868. Its totient is φ = 121891866.

The previous prime is 121891837. The next prime is 121891871. The reversal of 121891867 is 768198121.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (768198121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121891867 - 2⁷ = 121891739 is a prime.

It is not a weakly prime, because it can be changed into another prime (121891837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60945933 + 60945934.

It is an arithmetic number, because the mean of its divisors is an integer number (60945934).

Almost surely, 2^121891867 is an apocalyptic number.

121891867 is a deficient number, since it is larger than the sum of its proper divisors (1).

121891867 is an equidigital number, since it uses as much as digits as its factorization.

121891867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 43.

The square root of 121891867 is about 11040.4649811500. The cubic root of 121891867 is about 495.8209917571.

The spelling of 121891867 in words is "one hundred twenty-one million, eight hundred ninety-one thousand, eight hundred sixty-seven".