121499861 has 16 divisors (see below), whose sum is σ = 144038400. Its totient is φ = 102417840.

The previous prime is 121499831. The next prime is 121499887. The reversal of 121499861 is 168994121.

It is not a de Polignac number, because 121499861 - 2¹⁰ = 121498837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121499831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18020 + ... + 23826.

It is an arithmetic number, because the mean of its divisors is an integer number (9002400).

Almost surely, 2^121499861 is an apocalyptic number.

It is an amenable number.

121499861 is a deficient number, since it is larger than the sum of its proper divisors (22538539).

121499861 is an frugal number, since it uses more digits than its factorization.

121499861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5889 (or 5875 counting only the distinct ones).

The product of its digits is 31104, while the sum is 41.

The square root of 121499861 is about 11022.6975373545. The cubic root of 121499861 is about 495.2888984584.

The spelling of 121499861 in words is "one hundred twenty-one million, four hundred ninety-nine thousand, eight hundred sixty-one".