201814645 has 4 divisors (see below), whose sum is σ = 242177580. Its totient is φ = 161451712.

The previous prime is 201814643. The next prime is 201814661. The reversal of 201814645 is 546418102.

201814645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546418102 = 2 ⋅273209051.

It can be written as a sum of positive squares in 2 ways, for example, as 34939921 + 166874724 = 5911^2 + 12918^2 .

It is a cyclic number.

It is not a de Polignac number, because 201814645 - 2¹ = 201814643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201814643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20181460 + ... + 20181469.

It is an arithmetic number, because the mean of its divisors is an integer number (60544395).

Almost surely, 2^201814645 is an apocalyptic number.

It is an amenable number.

201814645 is a deficient number, since it is larger than the sum of its proper divisors (40362935).

201814645 is an equidigital number, since it uses as much as digits as its factorization.

201814645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40362934.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 201814645 is about 14206.1481408579. The cubic root of 201814645 is about 586.5669099423.

The spelling of 201814645 in words is "two hundred one million, eight hundred fourteen thousand, six hundred forty-five".