91291421777213 has 16 divisors (see below), whose sum is σ = 104880425109504. Its totient is φ = 77839270151040.

The previous prime is 91291421777197. The next prime is 91291421777261. The reversal of 91291421777213 is 31277712419219.

It is a cyclic number.

It is not a de Polignac number, because 91291421777213 - 2⁴ = 91291421777197 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 (91291421477213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146219681 + ... + 146842697.

It is an arithmetic number, because the mean of its divisors is an integer number (6555026569344).

Almost surely, 2^{91291421777213} is an apocalyptic number.

It is an amenable number.

91291421777213 is a deficient number, since it is larger than the sum of its proper divisors (13589003332291).

91291421777213 is a wasteful number, since it uses less digits than its factorization.

91291421777213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732812.

The product of its digits is 2667168, while the sum is 56.

The spelling of 91291421777213 in words is "ninety-one trillion, two hundred ninety-one billion, four hundred twenty-one million, seven hundred seventy-seven thousand, two hundred thirteen".