121899319 has 2 divisors, whose sum is σ = 121899320. Its totient is φ = 121899318.

The previous prime is 121899317. The next prime is 121899343. The reversal of 121899319 is 913998121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121899319 - 2¹ = 121899317 is a prime.

It is a super-2 number, since 2×121899319² = 29718887945327522, which contains 22 as substring.

Together with 121899317, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121899317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60949659 + 60949660.

It is an arithmetic number, because the mean of its divisors is an integer number (60949660).

Almost surely, 2^121899319 is an apocalyptic number.

121899319 is a deficient number, since it is larger than the sum of its proper divisors (1).

121899319 is an equidigital number, since it uses as much as digits as its factorization.

121899319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 43.

The square root of 121899319 is about 11040.8024617779. The cubic root of 121899319 is about 495.8310957474.

The spelling of 121899319 in words is "one hundred twenty-one million, eight hundred ninety-nine thousand, three hundred nineteen".