91506212155 has 16 divisors (see below), whose sum is σ = 110636967168. Its totient is φ = 72652860000.

The previous prime is 91506212129. The next prime is 91506212159. The reversal of 91506212155 is 55121260519.

It is a happy number.

It is not a de Polignac number, because 91506212155 - 2¹³ = 91506203963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91506212159) 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, 768160 + ... + 879250.

It is an arithmetic number, because the mean of its divisors is an integer number (6914810448).

Almost surely, 2^91506212155 is an apocalyptic number.

91506212155 is a deficient number, since it is larger than the sum of its proper divisors (19130755013).

91506212155 is a wasteful number, since it uses less digits than its factorization.

91506212155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112338.

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 91506212155 in words is "ninety-one billion, five hundred six million, two hundred twelve thousand, one hundred fifty-five".