91947243 has 4 divisors (see below), whose sum is σ = 122596328. Its totient is φ = 61298160.

The previous prime is 91947241. The next prime is 91947283. The reversal of 91947243 is 34274919.

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

It is not a de Polignac number, because 91947243 - 2¹ = 91947241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91947241) 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, 15324538 + ... + 15324543.

It is an arithmetic number, because the mean of its divisors is an integer number (30649082).

Almost surely, 2^91947243 is an apocalyptic number.

91947243 is a deficient number, since it is larger than the sum of its proper divisors (30649085).

91947243 is a wasteful number, since it uses less digits than its factorization.

91947243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30649084.

The product of its digits is 54432, while the sum is 39.

The square root of 91947243 is about 9588.9125035115. The cubic root of 91947243 is about 451.3494357596.

The spelling of 91947243 in words is "ninety-one million, nine hundred forty-seven thousand, two hundred forty-three".