91973609859 has 8 divisors (see below), whose sum is σ = 123157796112. Its totient is φ = 61052581760.

The previous prime is 91973609839. The next prime is 91973609879. The reversal of 91973609859 is 95890637919.

It is an interprime number because it is at equal distance from previous prime (91973609839) and next prime (91973609879).

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 91973609859 - 2²⁰ = 91972561283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91973609859.

It is not an unprimeable number, because it can be changed into a prime (91973609839) 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, 65788722 + ... + 65790119.

It is an arithmetic number, because the mean of its divisors is an integer number (15394724514).

Almost surely, 2^91973609859 is an apocalyptic number.

91973609859 is a deficient number, since it is larger than the sum of its proper divisors (31184186253).

91973609859 is a wasteful number, since it uses less digits than its factorization.

91973609859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131579077.

The product of its (nonzero) digits is 33067440, while the sum is 66.

The spelling of 91973609859 in words is "ninety-one billion, nine hundred seventy-three million, six hundred nine thousand, eight hundred fifty-nine".