201145231 has 4 divisors (see below), whose sum is σ = 229880272. Its totient is φ = 172410192.

The previous prime is 201145223. The next prime is 201145249. The reversal of 201145231 is 132541102.

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 201145231 - 2³ = 201145223 is a prime.

It is a super-2 number, since 2×201145231² = 80918807908086722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201145199 and 201145208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201145261) 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, 14367510 + ... + 14367523.

It is an arithmetic number, because the mean of its divisors is an integer number (57470068).

Almost surely, 2^201145231 is an apocalyptic number.

201145231 is a deficient number, since it is larger than the sum of its proper divisors (28735041).

201145231 is an equidigital number, since it uses as much as digits as its factorization.

201145231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28735040.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 201145231 is about 14182.5678563510. The cubic root of 201145231 is about 585.9176490877.

Adding to 201145231 its reverse (132541102), we get a palindrome (333686333).

The spelling of 201145231 in words is "two hundred one million, one hundred forty-five thousand, two hundred thirty-one".