971591 has 2 divisors, whose sum is σ = 971592. Its totient is φ = 971590.

The previous prime is 971569. The next prime is 971639. The reversal of 971591 is 195179.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 971591 - 2¹⁸ = 709447 is a prime.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 971591.

It is not a weakly prime, because it can be changed into another prime (971501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485795 + 485796.

It is an arithmetic number, because the mean of its divisors is an integer number (485796).

2⁹⁷¹⁵⁹¹ is an apocalyptic number.

971591 is a deficient number, since it is larger than the sum of its proper divisors (1).

971591 is an equidigital number, since it uses as much as digits as its factorization.

971591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2835, while the sum is 32.

The square root of 971591 is about 985.6931571235. The cubic root of 971591 is about 99.0439216056.

The spelling of 971591 in words is "nine hundred seventy-one thousand, five hundred ninety-one".