201423505 has 8 divisors (see below), whose sum is σ = 241935912. Its totient is φ = 160987008.

The previous prime is 201423499. The next prime is 201423527. The reversal of 201423505 is 505324102.

It can be written as a sum of positive squares in 4 ways, for example, as 84934656 + 116488849 = 9216^2 + 10793^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201423505 - 2²¹ = 199326353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12964 + ... + 23893.

It is an arithmetic number, because the mean of its divisors is an integer number (30241989).

Almost surely, 2^201423505 is an apocalyptic number.

It is an amenable number.

201423505 is a deficient number, since it is larger than the sum of its proper divisors (40512407).

201423505 is a wasteful number, since it uses less digits than its factorization.

201423505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37955.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 201423505 is about 14192.3748893552. The cubic root of 201423505 is about 586.1877201477.

Adding to 201423505 its reverse (505324102), we get a palindrome (706747607).

The spelling of 201423505 in words is "two hundred one million, four hundred twenty-three thousand, five hundred five".