115520257 has 4 divisors (see below), whose sum is σ = 115578580. Its totient is φ = 115461936.

The previous prime is 115520243. The next prime is 115520267. The reversal of 115520257 is 752025511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 752025511 = 467 ⋅1610333.

It can be written as a sum of positive squares in 2 ways, for example, as 95726656 + 19793601 = 9784^2 + 4449^2 .

It is a cyclic number.

It is not a de Polignac number, because 115520257 - 2¹¹ = 115518209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115520227) 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, 26082 + ... + 30187.

It is an arithmetic number, because the mean of its divisors is an integer number (28894645).

Almost surely, 2^115520257 is an apocalyptic number.

It is an amenable number.

115520257 is a deficient number, since it is larger than the sum of its proper divisors (58323).

115520257 is an equidigital number, since it uses as much as digits as its factorization.

115520257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58322.

The product of its (nonzero) digits is 3500, while the sum is 28.

The square root of 115520257 is about 10748.0350297159. The cubic root of 115520257 is about 487.0266377749.

Adding to 115520257 its reverse (752025511), we get a palindrome (867545768).

It can be divided in two parts, 1155 and 20257, that added together give a palindrome (21412).

The spelling of 115520257 in words is "one hundred fifteen million, five hundred twenty thousand, two hundred fifty-seven".