201102561 has 16 divisors (see below), whose sum is σ = 325014720. Its totient is φ = 121880160.

The previous prime is 201102557. The next prime is 201102589. The reversal of 201102561 is 165201102.

201102561 is a `hidden beast` number, since 2 + 0 + 1 + 102 + 561 = 666.

It is not a de Polignac number, because 201102561 - 2² = 201102557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201102361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 338260 + ... + 338853.

It is an arithmetic number, because the mean of its divisors is an integer number (20313420).

Almost surely, 2^201102561 is an apocalyptic number.

It is an amenable number.

201102561 is a deficient number, since it is larger than the sum of its proper divisors (123912159).

201102561 is a wasteful number, since it uses less digits than its factorization.

201102561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677133 (or 677127 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 201102561 is about 14181.0634650579. The cubic root of 201102561 is about 585.8762148894.

Adding to 201102561 its reverse (165201102), we get a palindrome (366303663).

The spelling of 201102561 in words is "two hundred one million, one hundred two thousand, five hundred sixty-one".