115405531 has 4 divisors (see below), whose sum is σ = 115593192. Its totient is φ = 115217872.

The previous prime is 115405457. The next prime is 115405541. The reversal of 115405531 is 135504511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135504511 = 2437 ⋅55603.

It is a cyclic number.

It is not a de Polignac number, because 115405531 - 2⁷ = 115405403 is a prime.

It is a super-2 number, since 2×115405531² = 26636873170783922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 115405496 and 115405505.

It is not an unprimeable number, because it can be changed into a prime (115405541) 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, 92905 + ... + 94138.

It is an arithmetic number, because the mean of its divisors is an integer number (28898298).

Almost surely, 2^115405531 is an apocalyptic number.

115405531 is a deficient number, since it is larger than the sum of its proper divisors (187661).

115405531 is an equidigital number, since it uses as much as digits as its factorization.

115405531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187660.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 115405531 is about 10742.6966353891. The cubic root of 115405531 is about 486.8653583407.

It can be divided in two parts, 11540 and 5531, that added together give a palindrome (17071).

The spelling of 115405531 in words is "one hundred fifteen million, four hundred five thousand, five hundred thirty-one".