83888991 has 12 divisors (see below), whose sum is σ = 121263168. Its totient is φ = 55884384.

The previous prime is 83888989. The next prime is 83889019. The reversal of 83888991 is 19988838.

It is not a de Polignac number, because 83888991 - 2¹ = 83888989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83888921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13851 + ... + 18963.

It is an arithmetic number, because the mean of its divisors is an integer number (10105264).

Almost surely, 2^83888991 is an apocalyptic number.

83888991 is a deficient number, since it is larger than the sum of its proper divisors (37374177).

83888991 is a wasteful number, since it uses less digits than its factorization.

83888991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6942 (or 6939 counting only the distinct ones).

The product of its digits is 995328, while the sum is 54.

The square root of 83888991 is about 9159.0933503268. The cubic root of 83888991 is about 437.7589059096.

The spelling of 83888991 in words is "eighty-three million, eight hundred eighty-eight thousand, nine hundred ninety-one".