97840591 has 2 divisors, whose sum is σ = 97840592. Its totient is φ = 97840590.

The previous prime is 97840583. The next prime is 97840607. The reversal of 97840591 is 19504879.

It is a weak prime.

It is an emirp because it is prime and its reverse (19504879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97840591 - 2³ = 97840583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97840531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48920295 + 48920296.

It is an arithmetic number, because the mean of its divisors is an integer number (48920296).

Almost surely, 2^97840591 is an apocalyptic number.

97840591 is a deficient number, since it is larger than the sum of its proper divisors (1).

97840591 is an equidigital number, since it uses as much as digits as its factorization.

97840591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 97840591 is about 9891.4402894624. The cubic root of 97840591 is about 460.7935122357.

The spelling of 97840591 in words is "ninety-seven million, eight hundred forty thousand, five hundred ninety-one".