91216943 has 4 divisors (see below), whose sum is σ = 91873320. Its totient is φ = 90560568.

The previous prime is 91216921. The next prime is 91216963. The reversal of 91216943 is 34961219.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91216943 - 2¹⁶ = 91151407 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 (91216913) 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, 327980 + ... + 328257.

It is an arithmetic number, because the mean of its divisors is an integer number (22968330).

Almost surely, 2^91216943 is an apocalyptic number.

91216943 is a deficient number, since it is larger than the sum of its proper divisors (656377).

91216943 is a wasteful number, since it uses less digits than its factorization.

91216943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656376.

The product of its digits is 11664, while the sum is 35.

The square root of 91216943 is about 9550.7561480754. The cubic root of 91216943 is about 450.1512956289.

The spelling of 91216943 in words is "ninety-one million, two hundred sixteen thousand, nine hundred forty-three".