91549911 has 4 divisors (see below), whose sum is σ = 122066552. Its totient is φ = 61033272.

The previous prime is 91549907. The next prime is 91549943. The reversal of 91549911 is 11994519.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11994519 = 3 ⋅3998173.

It is not a de Polignac number, because 91549911 - 2² = 91549907 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91549911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91549111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15258316 + ... + 15258321.

It is an arithmetic number, because the mean of its divisors is an integer number (30516638).

Almost surely, 2^91549911 is an apocalyptic number.

91549911 is a deficient number, since it is larger than the sum of its proper divisors (30516641).

91549911 is a wasteful number, since it uses less digits than its factorization.

91549911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30516640.

The product of its digits is 14580, while the sum is 39.

The square root of 91549911 is about 9568.1717689431. The cubic root of 91549911 is about 450.6983576294.

The spelling of 91549911 in words is "ninety-one million, five hundred forty-nine thousand, nine hundred eleven".