201082381 has 4 divisors (see below), whose sum is σ = 201960700. Its totient is φ = 200204064.

The previous prime is 201082373. The next prime is 201082391. The reversal of 201082381 is 183280102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 160250281 + 40832100 = 12659^2 + 6390^2 .

It is a cyclic number.

It is not a de Polignac number, because 201082381 - 2³ = 201082373 is a prime.

It is a super-2 number, since 2×201082381² = 80868247897258322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201082361) 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, 438816 + ... + 439273.

It is an arithmetic number, because the mean of its divisors is an integer number (50490175).

Almost surely, 2^201082381 is an apocalyptic number.

It is an amenable number.

201082381 is a deficient number, since it is larger than the sum of its proper divisors (878319).

201082381 is an equidigital number, since it uses as much as digits as its factorization.

201082381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878318.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 201082381 is about 14180.3519349838. The cubic root of 201082381 is about 585.8566172979.

The spelling of 201082381 in words is "two hundred one million, eighty-two thousand, three hundred eighty-one".