121579 has 2 divisors, whose sum is σ = 121580. Its totient is φ = 121578.

The previous prime is 121577. The next prime is 121591. The reversal of 121579 is 975121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121579 - 2¹ = 121577 is a prime.

Together with 121577, it forms a pair of twin primes.

121579 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (121571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60789 + 60790.

It is an arithmetic number, because the mean of its divisors is an integer number (60790).

2¹²¹⁵⁷⁹ is an apocalyptic number.

121579 is a deficient number, since it is larger than the sum of its proper divisors (1).

121579 is an equidigital number, since it uses as much as digits as its factorization.

121579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 630, while the sum is 25.

The square root of 121579 is about 348.6818033681. The cubic root of 121579 is about 49.5396410683.

The spelling of 121579 in words is "one hundred twenty-one thousand, five hundred seventy-nine".