201128513 has 4 divisors (see below), whose sum is σ = 212959620. Its totient is φ = 189297408.

The previous prime is 201128497. The next prime is 201128531. The reversal of 201128513 is 315821102.

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: 315821102 = 2 ⋅157910551.

It can be written as a sum of positive squares in 2 ways, for example, as 177235969 + 23892544 = 13313^2 + 4888^2 .

It is a cyclic number.

It is not a de Polignac number, because 201128513 - 2⁴ = 201128497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201128533) 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, 5915528 + ... + 5915561.

It is an arithmetic number, because the mean of its divisors is an integer number (53239905).

Almost surely, 2^201128513 is an apocalyptic number.

It is an amenable number.

201128513 is a deficient number, since it is larger than the sum of its proper divisors (11831107).

201128513 is a wasteful number, since it uses less digits than its factorization.

201128513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11831106.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 201128513 is about 14181.9784585931. The cubic root of 201128513 is about 585.9014159700.

Adding to 201128513 its reverse (315821102), we get a palindrome (516949615).

The spelling of 201128513 in words is "two hundred one million, one hundred twenty-eight thousand, five hundred thirteen".