201012491 has 2 divisors, whose sum is σ = 201012492. Its totient is φ = 201012490.

The previous prime is 201012481. The next prime is 201012499. The reversal of 201012491 is 194210102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201012491 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (201012499) 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, 100506245 + 100506246.

It is an arithmetic number, because the mean of its divisors is an integer number (100506246).

Almost surely, 2^201012491 is an apocalyptic number.

201012491 is a deficient number, since it is larger than the sum of its proper divisors (1).

201012491 is an equidigital number, since it uses as much as digits as its factorization.

201012491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 201012491 is about 14177.8873955184. The cubic root of 201012491 is about 585.7887342351.

Adding to 201012491 its reverse (194210102), we get a palindrome (395222593).

The spelling of 201012491 in words is "two hundred one million, twelve thousand, four hundred ninety-one".