121153999 has 2 divisors, whose sum is σ = 121154000. Its totient is φ = 121153998.

The previous prime is 121153997. The next prime is 121154071. The reversal of 121153999 is 999351121.

It is a weak prime.

It is an emirp because it is prime and its reverse (999351121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121153999 - 2¹ = 121153997 is a prime.

Together with 121153997, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121153997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60576999 + 60577000.

It is an arithmetic number, because the mean of its divisors is an integer number (60577000).

Almost surely, 2^121153999 is an apocalyptic number.

121153999 is a deficient number, since it is larger than the sum of its proper divisors (1).

121153999 is an equidigital number, since it uses as much as digits as its factorization.

121153999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21870, while the sum is 40.

The square root of 121153999 is about 11006.9977287179. The cubic root of 121153999 is about 494.8184880186.

The spelling of 121153999 in words is "one hundred twenty-one million, one hundred fifty-three thousand, nine hundred ninety-nine".