201145 has 12 divisors (see below), whose sum is σ = 281124. Its totient is φ = 137760.

The previous prime is 201139. The next prime is 201151. The reversal of 201145 is 541102.

201145 = T₆₅ + T₆₆ + ... + T₁₁₃.

201145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (201139) and next prime (201151).

It can be written as a sum of positive squares in 2 ways, for example, as 63504 + 137641 = 252^2 + 371^2 .

It is a de Polignac number, because none of the positive numbers 2^k-201145 is a prime.

It is a super-2 number, since 2×201145² = 80918622050, which contains 22 as substring.

It is a Duffinian number.

201145 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 166 + ... + 655.

It is an arithmetic number, because the mean of its divisors is an integer number (23427).

2²⁰¹¹⁴⁵ is an apocalyptic number.

It is an amenable number.

201145 is a deficient number, since it is larger than the sum of its proper divisors (79979).

201145 is an equidigital number, since it uses as much as digits as its factorization.

201145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840 (or 833 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 201145 is about 448.4919174300. The cubic root of 201145 is about 58.5917424794.

Adding to 201145 its reverse (541102), we get a palindrome (742247).

The spelling of 201145 in words is "two hundred one thousand, one hundred forty-five".