97840091 has 4 divisors (see below), whose sum is σ = 102094032. Its totient is φ = 93586152.

The previous prime is 97840081. The next prime is 97840129. The reversal of 97840091 is 19004879.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 97840091 - 2⁶ = 97840027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97840081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2126936 + ... + 2126981.

It is an arithmetic number, because the mean of its divisors is an integer number (25523508).

Almost surely, 2^97840091 is an apocalyptic number.

97840091 is a deficient number, since it is larger than the sum of its proper divisors (4253941).

97840091 is a wasteful number, since it uses less digits than its factorization.

97840091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4253940.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 97840091 is about 9891.4150150522. The cubic root of 97840091 is about 460.7927272952.

The spelling of 97840091 in words is "ninety-seven million, eight hundred forty thousand, ninety-one".