115400521 has 4 divisors (see below), whose sum is σ = 118519492. Its totient is φ = 112281552.

The previous prime is 115400501. The next prime is 115400543. The reversal of 115400521 is 125004511.

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 75255625 + 40144896 = 8675^2 + 6336^2 .

It is a cyclic number.

It is not a de Polignac number, because 115400521 - 2⁷ = 115400393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115400501) 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, 1559430 + ... + 1559503.

It is an arithmetic number, because the mean of its divisors is an integer number (29629873).

Almost surely, 2^115400521 is an apocalyptic number.

It is an amenable number.

115400521 is a deficient number, since it is larger than the sum of its proper divisors (3118971).

115400521 is an equidigital number, since it uses as much as digits as its factorization.

115400521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3118970.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 115400521 is about 10742.4634511829. The cubic root of 115400521 is about 486.8583129512.

It can be divided in two parts, 115400 and 521, that added together give a triangular number (115921 = T₄₈₁).

The spelling of 115400521 in words is "one hundred fifteen million, four hundred thousand, five hundred twenty-one".