91409545506 has 16 divisors (see below), whose sum is σ = 183005083584. Its totient is φ = 30438849744.

The previous prime is 91409545501. The next prime is 91409545523. The reversal of 91409545506 is 60554590419.

It is a super-2 number, since 2×91409545506² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91409545501) 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, 7743301 + ... + 7755096.

It is an arithmetic number, because the mean of its divisors is an integer number (11437817724).

Almost surely, 2^91409545506 is an apocalyptic number.

91409545506 is an abundant number, since it is smaller than the sum of its proper divisors (91595538078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91409545506 is a wasteful number, since it uses less digits than its factorization.

91409545506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15499385.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 91409545506 in words is "ninety-one billion, four hundred nine million, five hundred forty-five thousand, five hundred six".