115540421 has 4 divisors (see below), whose sum is σ = 115807692. Its totient is φ = 115273152.

The previous prime is 115540393. The next prime is 115540427. The reversal of 115540421 is 124045511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124045511 = 877 ⋅141443.

It can be written as a sum of positive squares in 2 ways, for example, as 43375396 + 72165025 = 6586^2 + 8495^2 .

It is a cyclic number.

It is not a de Polignac number, because 115540421 - 2⁶ = 115540357 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 (115540427) 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, 132986 + ... + 133851.

It is an arithmetic number, because the mean of its divisors is an integer number (28951923).

Almost surely, 2^115540421 is an apocalyptic number.

It is an amenable number.

115540421 is a deficient number, since it is larger than the sum of its proper divisors (267271).

115540421 is an equidigital number, since it uses as much as digits as its factorization.

115540421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267270.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 115540421 is about 10748.9730207123. The cubic root of 115540421 is about 487.0549728740.

Adding to 115540421 its reverse (124045511), we get a palindrome (239585932).

The spelling of 115540421 in words is "one hundred fifteen million, five hundred forty thousand, four hundred twenty-one".