91487879 has 8 divisors (see below), whose sum is σ = 105381888. Its totient is φ = 77799960.

The previous prime is 91487873. The next prime is 91487887. The reversal of 91487879 is 97878419.

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

It is not a de Polignac number, because 91487879 - 2⁸ = 91487623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91487879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91487873) 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, 50567 + ... + 52344.

It is an arithmetic number, because the mean of its divisors is an integer number (13172736).

Almost surely, 2^91487879 is an apocalyptic number.

91487879 is a deficient number, since it is larger than the sum of its proper divisors (13894009).

91487879 is a wasteful number, since it uses less digits than its factorization.

91487879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103045.

The product of its digits is 1016064, while the sum is 53.

The square root of 91487879 is about 9564.9296390512. The cubic root of 91487879 is about 450.5965405364.

The spelling of 91487879 in words is "ninety-one million, four hundred eighty-seven thousand, eight hundred seventy-nine".