91781216414 has 16 divisors (see below), whose sum is σ = 141619786560. Its totient is φ = 44583987840.

The previous prime is 91781216357. The next prime is 91781216459. The reversal of 91781216414 is 41461218719.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2321999 + ... + 2361194.

It is an arithmetic number, because the mean of its divisors is an integer number (8851236660).

Almost surely, 2^91781216414 is an apocalyptic number.

91781216414 is a deficient number, since it is larger than the sum of its proper divisors (49838570146).

91781216414 is a wasteful number, since it uses less digits than its factorization.

91781216414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4683475.

The product of its digits is 96768, while the sum is 44.

The spelling of 91781216414 in words is "ninety-one billion, seven hundred eighty-one million, two hundred sixteen thousand, four hundred fourteen".