91288007879 has 4 divisors (see below), whose sum is σ = 93010423176. Its totient is φ = 89565592584.

The previous prime is 91288007873. The next prime is 91288007897. The reversal of 91288007879 is 97870088219.

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 91288007879 - 2⁸ = 91288007623 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 (91288007873) 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, 861207569 + ... + 861207674.

It is an arithmetic number, because the mean of its divisors is an integer number (23252605794).

Almost surely, 2^91288007879 is an apocalyptic number.

91288007879 is a deficient number, since it is larger than the sum of its proper divisors (1722415297).

91288007879 is a wasteful number, since it uses less digits than its factorization.

91288007879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722415296.

The product of its (nonzero) digits is 4064256, while the sum is 59.

The spelling of 91288007879 in words is "ninety-one billion, two hundred eighty-eight million, seven thousand, eight hundred seventy-nine".