115521331 has 4 divisors (see below), whose sum is σ = 117148464. Its totient is φ = 113894200.

The previous prime is 115521319. The next prime is 115521379. The reversal of 115521331 is 133125511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 115521331 - 2⁹ = 115520819 is a prime.

It is a super-2 number, since 2×115521331² = 26690355832023122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115521031) 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, 813460 + ... + 813601.

It is an arithmetic number, because the mean of its divisors is an integer number (29287116).

Almost surely, 2^115521331 is an apocalyptic number.

115521331 is a deficient number, since it is larger than the sum of its proper divisors (1627133).

115521331 is an equidigital number, since it uses as much as digits as its factorization.

115521331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627132.

The product of its digits is 450, while the sum is 22.

The square root of 115521331 is about 10748.0849922207. The cubic root of 115521331 is about 487.0281470772.

Adding to 115521331 its reverse (133125511), we get a palindrome (248646842).

The spelling of 115521331 in words is "one hundred fifteen million, five hundred twenty-one thousand, three hundred thirty-one".