121323581 has 2 divisors, whose sum is σ = 121323582. Its totient is φ = 121323580.

The previous prime is 121323563. The next prime is 121323583. The reversal of 121323581 is 185323121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108784900 + 12538681 = 10430^2 + 3541^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121323581 is a prime.

It is a super-2 number, since 2×121323581² = 29438822613327122, which contains 22 as substring.

Together with 121323583, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121323581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121323583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60661790 + 60661791.

It is an arithmetic number, because the mean of its divisors is an integer number (60661791).

Almost surely, 2^121323581 is an apocalyptic number.

It is an amenable number.

121323581 is a deficient number, since it is larger than the sum of its proper divisors (1).

121323581 is an equidigital number, since it uses as much as digits as its factorization.

121323581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 26.

The square root of 121323581 is about 11014.6984071285. The cubic root of 121323581 is about 495.0492499377.

The spelling of 121323581 in words is "one hundred twenty-one million, three hundred twenty-three thousand, five hundred eighty-one".