201597491 has 2 divisors, whose sum is σ = 201597492. Its totient is φ = 201597490.

The previous prime is 201597481. The next prime is 201597511. The reversal of 201597491 is 194795102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201597491 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (201597401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100798745 + 100798746.

It is an arithmetic number, because the mean of its divisors is an integer number (100798746).

Almost surely, 2^201597491 is an apocalyptic number.

201597491 is a deficient number, since it is larger than the sum of its proper divisors (1).

201597491 is an equidigital number, since it uses as much as digits as its factorization.

201597491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 201597491 is about 14198.5031253298. The cubic root of 201597491 is about 586.3564510438.

The spelling of 201597491 in words is "two hundred one million, five hundred ninety-seven thousand, four hundred ninety-one".