201011381 has 2 divisors, whose sum is σ = 201011382. Its totient is φ = 201011380.

The previous prime is 201011357. The next prime is 201011443. The reversal of 201011381 is 183110102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164891281 + 36120100 = 12841^2 + 6010^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201011381 is a prime.

It is a super-2 number, since 2×201011381² = 80811150583054322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201011341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100505690 + 100505691.

It is an arithmetic number, because the mean of its divisors is an integer number (100505691).

Almost surely, 2^201011381 is an apocalyptic number.

It is an amenable number.

201011381 is a deficient number, since it is larger than the sum of its proper divisors (1).

201011381 is an equidigital number, since it uses as much as digits as its factorization.

201011381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 201011381 is about 14177.8482499990. The cubic root of 201011381 is about 585.7876559826.

Adding to 201011381 its reverse (183110102), we get a palindrome (384121483).

The spelling of 201011381 in words is "two hundred one million, eleven thousand, three hundred eighty-one".