201017381 has 2 divisors, whose sum is σ = 201017382. Its totient is φ = 201017380.

The previous prime is 201017363. The next prime is 201017417. The reversal of 201017381 is 183710102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103205281 + 97812100 = 10159^2 + 9890^2 .

It is a cyclic number.

It is not a de Polignac number, because 201017381 - 2¹⁴ = 201000997 is a prime.

It is a super-2 number, since 2×201017381² = 80815974928198322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201017351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100508690 + 100508691.

It is an arithmetic number, because the mean of its divisors is an integer number (100508691).

Almost surely, 2^201017381 is an apocalyptic number.

It is an amenable number.

201017381 is a deficient number, since it is larger than the sum of its proper divisors (1).

201017381 is an equidigital number, since it uses as much as digits as its factorization.

201017381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 201017381 is about 14178.0598461143. The cubic root of 201017381 is about 585.7934843275.

Adding to 201017381 its reverse (183710102), we get a palindrome (384727483).

It can be divided in two parts, 2010 and 17381, that added together give a palindrome (19391).

The spelling of 201017381 in words is "two hundred one million, seventeen thousand, three hundred eighty-one".