83736991 has 4 divisors (see below), whose sum is σ = 90178312. Its totient is φ = 77295672.

The previous prime is 83736977. The next prime is 83737001. The reversal of 83736991 is 19963738.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19963738 = 2 ⋅9981869.

It is a cyclic number.

It is not a de Polignac number, because 83736991 - 2¹¹ = 83734943 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 (83736901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3220641 + ... + 3220666.

It is an arithmetic number, because the mean of its divisors is an integer number (22544578).

Almost surely, 2^83736991 is an apocalyptic number.

83736991 is a deficient number, since it is larger than the sum of its proper divisors (6441321).

83736991 is a wasteful number, since it uses less digits than its factorization.

83736991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6441320.

The product of its digits is 244944, while the sum is 46.

The square root of 83736991 is about 9150.7918236620. The cubic root of 83736991 is about 437.4943516005.

The spelling of 83736991 in words is "eighty-three million, seven hundred thirty-six thousand, nine hundred ninety-one".