201423001 has 4 divisors (see below), whose sum is σ = 216917092. Its totient is φ = 185928912.

The previous prime is 201422981. The next prime is 201423023. The reversal of 201423001 is 100324102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 101022601 + 100400400 = 10051^2 + 10020^2 .

It is not a de Polignac number, because 201423001 - 2¹⁹ = 200898713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 15494077 = 201423001 / (2 + 0 + 1 + 4 + 2 + 3 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201423031) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7747026 + ... + 7747051.

It is an arithmetic number, because the mean of its divisors is an integer number (54229273).

Almost surely, 2^201423001 is an apocalyptic number.

It is an amenable number.

201423001 is a deficient number, since it is larger than the sum of its proper divisors (15494091).

201423001 is a wasteful number, since it uses less digits than its factorization.

201423001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15494090.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 201423001 is about 14192.3571333306. The cubic root of 201423001 is about 586.1872312295.

Adding to 201423001 its reverse (100324102), we get a palindrome (301747103).

The spelling of 201423001 in words is "two hundred one million, four hundred twenty-three thousand, one".