201981313 has 2 divisors, whose sum is σ = 201981314. Its totient is φ = 201981312.

The previous prime is 201981289. The next prime is 201981359. The reversal of 201981313 is 313189102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186677569 + 15303744 = 13663^2 + 3912^2 .

It is a cyclic number.

It is not a de Polignac number, because 201981313 - 2⁵ = 201981281 is a prime.

It is not a weakly prime, because it can be changed into another prime (201981383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100990656 + 100990657.

It is an arithmetic number, because the mean of its divisors is an integer number (100990657).

Almost surely, 2^201981313 is an apocalyptic number.

It is an amenable number.

201981313 is a deficient number, since it is larger than the sum of its proper divisors (1).

201981313 is an equidigital number, since it uses as much as digits as its factorization.

201981313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 201981313 is about 14212.0129819811. The cubic root of 201981313 is about 586.7283370016.

The spelling of 201981313 in words is "two hundred one million, nine hundred eighty-one thousand, three hundred thirteen".