201012991 has 2 divisors, whose sum is σ = 201012992. Its totient is φ = 201012990.

The previous prime is 201012961. The next prime is 201013009. The reversal of 201012991 is 199210102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201012991 - 2²¹ = 198915839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201012901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100506495 + 100506496.

It is an arithmetic number, because the mean of its divisors is an integer number (100506496).

Almost surely, 2^201012991 is an apocalyptic number.

201012991 is a deficient number, since it is larger than the sum of its proper divisors (1).

201012991 is an equidigital number, since it uses as much as digits as its factorization.

201012991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 201012991 is about 14177.9050286000. The cubic root of 201012991 is about 585.7892199332.

The spelling of 201012991 in words is "two hundred one million, twelve thousand, nine hundred ninety-one".