201142423 has 4 divisors (see below), whose sum is σ = 201364128. Its totient is φ = 200920720.

The previous prime is 201142421. The next prime is 201142427. The reversal of 201142423 is 324241102.

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 201142423 - 2¹ = 201142421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201142423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201142421) 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, 109486 + ... + 111307.

It is an arithmetic number, because the mean of its divisors is an integer number (50341032).

Almost surely, 2^201142423 is an apocalyptic number.

201142423 is a deficient number, since it is larger than the sum of its proper divisors (221705).

201142423 is an equidigital number, since it uses as much as digits as its factorization.

201142423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221704.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 201142423 is about 14182.4688612385. The cubic root of 201142423 is about 585.9149225927.

Adding to 201142423 its reverse (324241102), we get a palindrome (525383525).

The spelling of 201142423 in words is "two hundred one million, one hundred forty-two thousand, four hundred twenty-three".