91840879 has 8 divisors (see below), whose sum is σ = 102096512. Its totient is φ = 82041120.

The previous prime is 91840871. The next prime is 91840907. The reversal of 91840879 is 97804819.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91840879 - 2³ = 91840871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91840871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113544 + ... + 114349.

It is an arithmetic number, because the mean of its divisors is an integer number (12762064).

Almost surely, 2^91840879 is an apocalyptic number.

91840879 is a deficient number, since it is larger than the sum of its proper divisors (10255633).

91840879 is a wasteful number, since it uses less digits than its factorization.

91840879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227937.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 91840879 is about 9583.3647013979. The cubic root of 91840879 is about 451.1753291986.

The spelling of 91840879 in words is "ninety-one million, eight hundred forty thousand, eight hundred seventy-nine".