201123645 has 32 divisors (see below), whose sum is σ = 341383680. Its totient is φ = 100825920.

The previous prime is 201123631. The next prime is 201123653. The reversal of 201123645 is 546321102.

It is not a de Polignac number, because 201123645 - 2²¹ = 199026493 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34642 + ... + 40028.

It is an arithmetic number, because the mean of its divisors is an integer number (10668240).

Almost surely, 2^201123645 is an apocalyptic number.

It is an amenable number.

201123645 is a deficient number, since it is larger than the sum of its proper divisors (140260035).

201123645 is a wasteful number, since it uses less digits than its factorization.

201123645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5545.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 201123645 is about 14181.8068312892. The cubic root of 201123645 is about 585.8966889904.

Adding to 201123645 its reverse (546321102), we get a palindrome (747444747).

The spelling of 201123645 in words is "two hundred one million, one hundred twenty-three thousand, six hundred forty-five".