121447819 has 2 divisors, whose sum is σ = 121447820. Its totient is φ = 121447818.

The previous prime is 121447817. The next prime is 121447831. The reversal of 121447819 is 918744121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121447819 - 2¹ = 121447817 is a prime.

It is a super-2 number, since 2×121447819² = 29499145479713522, which contains 22 as substring.

Together with 121447817, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (121447811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60723909 + 60723910.

It is an arithmetic number, because the mean of its divisors is an integer number (60723910).

Almost surely, 2^121447819 is an apocalyptic number.

121447819 is a deficient number, since it is larger than the sum of its proper divisors (1).

121447819 is an equidigital number, since it uses as much as digits as its factorization.

121447819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 37.

The square root of 121447819 is about 11020.3366101041. The cubic root of 121447819 is about 495.2181727097.

The spelling of 121447819 in words is "one hundred twenty-one million, four hundred forty-seven thousand, eight hundred nineteen".