91289983 has 4 divisors (see below), whose sum is σ = 96660000. Its totient is φ = 85919968.

The previous prime is 91289981. The next prime is 91289993. The reversal of 91289983 is 38998219.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38998219 = 13 ⋅2999863.

It is a cyclic number.

It is not a de Polignac number, because 91289983 - 2¹ = 91289981 is a prime.

It is a super-2 number, since 2×91289983² = 16667721992280578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91289981) 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, 2684983 + ... + 2685016.

It is an arithmetic number, because the mean of its divisors is an integer number (24165000).

Almost surely, 2^91289983 is an apocalyptic number.

91289983 is a deficient number, since it is larger than the sum of its proper divisors (5370017).

91289983 is a wasteful number, since it uses less digits than its factorization.

91289983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5370016.

The product of its digits is 279936, while the sum is 49.

The square root of 91289983 is about 9554.5791639402. The cubic root of 91289983 is about 450.2714132215.

The spelling of 91289983 in words is "ninety-one million, two hundred eighty-nine thousand, nine hundred eighty-three".