201082991 has 2 divisors, whose sum is σ = 201082992. Its totient is φ = 201082990.

The previous prime is 201082969. The next prime is 201082993. The reversal of 201082991 is 199280102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201082991 is a prime.

Together with 201082993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201082993) 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, 100541495 + 100541496.

It is an arithmetic number, because the mean of its divisors is an integer number (100541496).

Almost surely, 2^201082991 is an apocalyptic number.

201082991 is a deficient number, since it is larger than the sum of its proper divisors (1).

201082991 is an equidigital number, since it uses as much as digits as its factorization.

201082991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 201082991 is about 14180.3734436015. The cubic root of 201082991 is about 585.8572097121.

It can be divided in two parts, 20108 and 2991, that multiplied together give a triangular number (60143028 = T₁₀₉₆₇).

The spelling of 201082991 in words is "two hundred one million, eighty-two thousand, nine hundred ninety-one".