113201581 has 4 divisors (see below), whose sum is σ = 113294332. Its totient is φ = 113108832.

The previous prime is 113201573. The next prime is 113201603. The reversal of 113201581 is 185102311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 185102311 = 163 ⋅1135597.

It can be written as a sum of positive squares in 2 ways, for example, as 40525956 + 72675625 = 6366^2 + 8525^2 .

It is a cyclic number.

It is not a de Polignac number, because 113201581 - 2³ = 113201573 is a prime.

It is a super-2 number, since 2×113201581² = 25629195881799122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113201531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44520 + ... + 46993.

It is an arithmetic number, because the mean of its divisors is an integer number (28323583).

Almost surely, 2^113201581 is an apocalyptic number.

It is an amenable number.

113201581 is a deficient number, since it is larger than the sum of its proper divisors (92751).

113201581 is an equidigital number, since it uses as much as digits as its factorization.

113201581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92750.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 113201581 is about 10639.6231606199. The cubic root of 113201581 is about 483.7461230874.

Adding to 113201581 its reverse (185102311), we get a palindrome (298303892).

It can be divided in two parts, 1132015 and 81, that added together give a square (1132096 = 1064²).

The spelling of 113201581 in words is "one hundred thirteen million, two hundred one thousand, five hundred eighty-one".