121699 has 4 divisors (see below), whose sum is σ = 122760. Its totient is φ = 120640.

The previous prime is 121697. The next prime is 121711. The reversal of 121699 is 996121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 121699 - 2¹ = 121697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 334 + ... + 595.

It is an arithmetic number, because the mean of its divisors is an integer number (30690).

2¹²¹⁶⁹⁹ is an apocalyptic number.

121699 is a deficient number, since it is larger than the sum of its proper divisors (1061).

121699 is an equidigital number, since it uses as much as digits as its factorization.

121699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060.

The product of its digits is 972, while the sum is 28.

The square root of 121699 is about 348.8538375882. The cubic root of 121699 is about 49.5559344582. Note that the first 3 decimals are identical.

It can be divided in two parts, 121 and 699, that added together give a triangular number (820 = T₄₀).

The spelling of 121699 in words is "one hundred twenty-one thousand, six hundred ninety-nine".