201523523 has 4 divisors (see below), whose sum is σ = 208472640. Its totient is φ = 194574408.

The previous prime is 201523463. The next prime is 201523537. The reversal of 201523523 is 325325102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201523523 - 2¹⁰ = 201522499 is a prime.

It is a super-2 number, since 2×201523523² = 81223460644663058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201523123) 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, 3474515 + ... + 3474572.

It is an arithmetic number, because the mean of its divisors is an integer number (52118160).

Almost surely, 2^201523523 is an apocalyptic number.

201523523 is a deficient number, since it is larger than the sum of its proper divisors (6949117).

201523523 is an equidigital number, since it uses as much as digits as its factorization.

201523523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6949116.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 201523523 is about 14195.8981047343. The cubic root of 201523523 is about 586.2847290541.

Adding to 201523523 its reverse (325325102), we get a palindrome (526848625).

The spelling of 201523523 in words is "two hundred one million, five hundred twenty-three thousand, five hundred twenty-three".