201522143 has 4 divisors (see below), whose sum is σ = 203371080. Its totient is φ = 199673208.

The previous prime is 201522119. The next prime is 201522173. The reversal of 201522143 is 341225102.

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 201522143 - 2²² = 197327839 is a prime.

It is a super-2 number, since 2×201522143² = 81222348238624898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201522173) 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, 924305 + ... + 924522.

It is an arithmetic number, because the mean of its divisors is an integer number (50842770).

Almost surely, 2^201522143 is an apocalyptic number.

201522143 is a deficient number, since it is larger than the sum of its proper divisors (1848937).

201522143 is a wasteful number, since it uses less digits than its factorization.

201522143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1848936.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 201522143 is about 14195.8494990613. The cubic root of 201522143 is about 586.2833907905.

Adding to 201522143 its reverse (341225102), we get a palindrome (542747245).

The spelling of 201522143 in words is "two hundred one million, five hundred twenty-two thousand, one hundred forty-three".