201513123 has 32 divisors (see below), whose sum is σ = 346014720. Its totient is φ = 113520960.

The previous prime is 201513119. The next prime is 201513133. The reversal of 201513123 is 321315102.

It is not a de Polignac number, because 201513123 - 2² = 201513119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201513096 and 201513105.

It is not an unprimeable number, because it can be changed into a prime (201513133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5911 + ... + 20927.

It is an arithmetic number, because the mean of its divisors is an integer number (10812960).

Almost surely, 2^201513123 is an apocalyptic number.

201513123 is a deficient number, since it is larger than the sum of its proper divisors (144501597).

201513123 is a wasteful number, since it uses less digits than its factorization.

201513123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15104 (or 15098 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 201513123 is about 14195.5317970127. The cubic root of 201513123 is about 586.2746434389.

Adding to 201513123 its reverse (321315102), we get a palindrome (522828225).

The spelling of 201513123 in words is "two hundred one million, five hundred thirteen thousand, one hundred twenty-three".