121499999 has 4 divisors (see below), whose sum is σ = 121578336. Its totient is φ = 121421664.

The previous prime is 121499993. The next prime is 121500019. The reversal of 121499999 is 999994121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121499999 - 2¹⁶ = 121434463 is a prime.

It is a Duffinian number.

121499999 is a modest number, since divided by 99999 gives 1214 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 121499999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121499993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36794 + ... + 39959.

It is an arithmetic number, because the mean of its divisors is an integer number (30394584).

Almost surely, 2^121499999 is an apocalyptic number.

121499999 is a deficient number, since it is larger than the sum of its proper divisors (78337).

121499999 is an equidigital number, since it uses as much as digits as its factorization.

121499999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78336.

The product of its digits is 472392, while the sum is 53.

The square root of 121499999 is about 11022.7037971634. The cubic root of 121499999 is about 495.2890859754.

The spelling of 121499999 in words is "one hundred twenty-one million, four hundred ninety-nine thousand, nine hundred ninety-nine".