201982381 has 4 divisors (see below), whose sum is σ = 204539200. Its totient is φ = 199425564.

The previous prime is 201982373. The next prime is 201982393. The reversal of 201982381 is 183289102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201982381 - 2³ = 201982373 is a prime.

It is a super-2 number, since 2×201982381² = 81593764468858322, 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 (201982301) 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, 1278291 + ... + 1278448.

It is an arithmetic number, because the mean of its divisors is an integer number (51134800).

Almost surely, 2^201982381 is an apocalyptic number.

It is an amenable number.

201982381 is a deficient number, since it is larger than the sum of its proper divisors (2556819).

201982381 is an equidigital number, since it uses as much as digits as its factorization.

201982381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2556818.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 201982381 is about 14212.0505557784. The cubic root of 201982381 is about 586.7293711315.

The spelling of 201982381 in words is "two hundred one million, nine hundred eighty-two thousand, three hundred eighty-one".