115312213 has 4 divisors (see below), whose sum is σ = 118124748. Its totient is φ = 112499680.

The previous prime is 115312199. The next prime is 115312217. The reversal of 115312213 is 312213511.

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 5963364 + 109348849 = 2442^2 + 10457^2 .

It is a cyclic number.

It is not a de Polignac number, because 115312213 - 2⁵ = 115312181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115312217) 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, 1406206 + ... + 1406287.

It is an arithmetic number, because the mean of its divisors is an integer number (29531187).

Almost surely, 2^115312213 is an apocalyptic number.

It is an amenable number.

115312213 is a deficient number, since it is larger than the sum of its proper divisors (2812535).

115312213 is an equidigital number, since it uses as much as digits as its factorization.

115312213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2812534.

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

The square root of 115312213 is about 10738.3524341493. The cubic root of 115312213 is about 486.7340949816.

Adding to 115312213 its reverse (312213511), we get a palindrome (427525724).

It can be divided in two parts, 1153 and 12213, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 115312213 in words is "one hundred fifteen million, three hundred twelve thousand, two hundred thirteen".