201423549 has 4 divisors (see below), whose sum is σ = 268564736. Its totient is φ = 134282364.

The previous prime is 201423533. The next prime is 201423553. The reversal of 201423549 is 945324102.

201423549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 201423549 - 2⁴ = 201423533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201423559) 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, 33570589 + ... + 33570594.

It is an arithmetic number, because the mean of its divisors is an integer number (67141184).

Almost surely, 2^201423549 is an apocalyptic number.

It is an amenable number.

201423549 is a deficient number, since it is larger than the sum of its proper divisors (67141187).

201423549 is an equidigital number, since it uses as much as digits as its factorization.

201423549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67141186.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 201423549 is about 14192.3764394833. The cubic root of 201423549 is about 586.1877628310.

The spelling of 201423549 in words is "two hundred one million, four hundred twenty-three thousand, five hundred forty-nine".