91549967 has 4 divisors (see below), whose sum is σ = 93679080. Its totient is φ = 89420856.

The previous prime is 91549963. The next prime is 91550009. The reversal of 91549967 is 76994519.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76994519 = 7 ⋅10999217.

It is a cyclic number.

It is not a de Polignac number, because 91549967 - 2² = 91549963 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 (91549963) 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, 1064492 + ... + 1064577.

It is an arithmetic number, because the mean of its divisors is an integer number (23419770).

Almost surely, 2^91549967 is an apocalyptic number.

91549967 is a deficient number, since it is larger than the sum of its proper divisors (2129113).

91549967 is a wasteful number, since it uses less digits than its factorization.

91549967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129112.

The product of its digits is 612360, while the sum is 50.

The square root of 91549967 is about 9568.1746953115. The cubic root of 91549967 is about 450.6984495250.

The spelling of 91549967 in words is "ninety-one million, five hundred forty-nine thousand, nine hundred sixty-seven".