91113983 has 4 divisors (see below), whose sum is σ = 91460688. Its totient is φ = 90767280.

The previous prime is 91113977. The next prime is 91114003. The reversal of 91113983 is 38931119.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38931119 = 73 ⋅533303.

It is a cyclic number.

It is not a de Polignac number, because 91113983 - 2¹⁴ = 91097599 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 (91113973) 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, 172958 + ... + 173483.

It is an arithmetic number, because the mean of its divisors is an integer number (22865172).

Almost surely, 2^91113983 is an apocalyptic number.

91113983 is a deficient number, since it is larger than the sum of its proper divisors (346705).

91113983 is a wasteful number, since it uses less digits than its factorization.

91113983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346704.

The product of its digits is 5832, while the sum is 35.

The square root of 91113983 is about 9545.3644770642. The cubic root of 91113983 is about 449.9818642897.

The spelling of 91113983 in words is "ninety-one million, one hundred thirteen thousand, nine hundred eighty-three".