91586678421 has 32 divisors (see below), whose sum is σ = 143445157888. Its totient is φ = 50880778560.

The previous prime is 91586678389. The next prime is 91586678471. The reversal of 91586678421 is 12487668519.

It is not a de Polignac number, because 91586678421 - 2⁵ = 91586678389 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 (91586678471) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 957456 + ... + 1048758.

It is an arithmetic number, because the mean of its divisors is an integer number (4482661184).

Almost surely, 2^91586678421 is an apocalyptic number.

It is an amenable number.

91586678421 is a deficient number, since it is larger than the sum of its proper divisors (51858479467).

91586678421 is a wasteful number, since it uses less digits than its factorization.

91586678421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92641.

The product of its digits is 5806080, while the sum is 57.

The spelling of 91586678421 in words is "ninety-one billion, five hundred eighty-six million, six hundred seventy-eight thousand, four hundred twenty-one".