115312321 has 4 divisors (see below), whose sum is σ = 115586644. Its totient is φ = 115038000.

The previous prime is 115312297. The next prime is 115312361. The reversal of 115312321 is 123213511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123213511 = 1607 ⋅76673.

It can be written as a sum of positive squares in 2 ways, for example, as 929296 + 114383025 = 964^2 + 10695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115312321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115312361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136530 + ... + 137371.

It is an arithmetic number, because the mean of its divisors is an integer number (28896661).

Almost surely, 2^115312321 is an apocalyptic number.

It is an amenable number.

115312321 is a deficient number, since it is larger than the sum of its proper divisors (274323).

115312321 is an equidigital number, since it uses as much as digits as its factorization.

115312321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274322.

The product of its digits is 180, while the sum is 19.

The square root of 115312321 is about 10738.3574628525. The cubic root of 115312321 is about 486.7342469380.

Adding to 115312321 its reverse (123213511), we get a palindrome (238525832).

The spelling of 115312321 in words is "one hundred fifteen million, three hundred twelve thousand, three hundred twenty-one".