201142523 has 4 divisors (see below), whose sum is σ = 201777360. Its totient is φ = 200507688.

The previous prime is 201142517. The next prime is 201142541. The reversal of 201142523 is 325241102.

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 201142523 - 2⁸ = 201142267 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201142495 and 201142504.

It is not an unprimeable number, because it can be changed into a prime (201142553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316943 + ... + 317576.

It is an arithmetic number, because the mean of its divisors is an integer number (50444340).

Almost surely, 2^201142523 is an apocalyptic number.

201142523 is a deficient number, since it is larger than the sum of its proper divisors (634837).

201142523 is an equidigital number, since it uses as much as digits as its factorization.

201142523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634836.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 201142523 is about 14182.4723867173. The cubic root of 201142523 is about 585.9150196905.

Adding to 201142523 its reverse (325241102), we get a palindrome (526383625).

The spelling of 201142523 in words is "two hundred one million, one hundred forty-two thousand, five hundred twenty-three".