121529 has 4 divisors (see below), whose sum is σ = 123876. Its totient is φ = 119184.

The previous prime is 121523. The next prime is 121531. The reversal of 121529 is 925121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 61504 + 60025 = 248^2 + 245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121529.

It is not an unprimeable number, because it can be changed into a prime (121523) 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, 1094 + ... + 1199.

It is an arithmetic number, because the mean of its divisors is an integer number (30969).

2¹²¹⁵²⁹ is an apocalyptic number.

It is an amenable number.

121529 is a deficient number, since it is larger than the sum of its proper divisors (2347).

121529 is an equidigital number, since it uses as much as digits as its factorization.

121529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2346.

The product of its digits is 180, while the sum is 20.

The square root of 121529 is about 348.6100973868. The cubic root of 121529 is about 49.5328489916.

It can be divided in two parts, 121 and 529, that multiplied together give a square (64009 = 253²).

The spelling of 121529 in words is "one hundred twenty-one thousand, five hundred twenty-nine".