201423531 has 16 divisors (see below), whose sum is σ = 294170400. Its totient is φ = 122024448.

The previous prime is 201423527. The next prime is 201423533. The reversal of 201423531 is 135324102.

It is not a de Polignac number, because 201423531 - 2² = 201423527 is a prime.

It is a super-2 number, since 2×201423531² = 81142877681015922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 201423498 and 201423507.

It is not an unprimeable number, because it can be changed into a prime (201423533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66616 + ... + 69573.

It is an arithmetic number, because the mean of its divisors is an integer number (18385650).

Almost surely, 2^201423531 is an apocalyptic number.

201423531 is a deficient number, since it is larger than the sum of its proper divisors (92746869).

201423531 is a wasteful number, since it uses less digits than its factorization.

201423531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136238.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 201423531 is about 14192.3758053400. The cubic root of 201423531 is about 586.1877453696.

Adding to 201423531 its reverse (135324102), we get a palindrome (336747633).

The spelling of 201423531 in words is "two hundred one million, four hundred twenty-three thousand, five hundred thirty-one".