202315121 has 2 divisors, whose sum is σ = 202315122. Its totient is φ = 202315120.

The previous prime is 202315109. The next prime is 202315123. The reversal of 202315121 is 121513202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119596096 + 82719025 = 10936^2 + 9095^2 .

It is a cyclic number.

It is not a de Polignac number, because 202315121 - 2²⁶ = 135206257 is a prime.

Together with 202315123, 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 202315121.

It is not a weakly prime, because it can be changed into another prime (202315123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101157560 + 101157561.

It is an arithmetic number, because the mean of its divisors is an integer number (101157561).

Almost surely, 2^202315121 is an apocalyptic number.

It is an amenable number.

202315121 is a deficient number, since it is larger than the sum of its proper divisors (1).

202315121 is an equidigital number, since it uses as much as digits as its factorization.

202315121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 202315121 is about 14223.7520014938. The cubic root of 202315121 is about 587.0513814366.

Adding to 202315121 its reverse (121513202), we get a palindrome (323828323).

It can be divided in two parts, 20231 and 5121, that added together give a palindrome (25352).

The spelling of 202315121 in words is "two hundred two million, three hundred fifteen thousand, one hundred twenty-one".