91988534 has 16 divisors (see below), whose sum is σ = 150690240. Its totient is φ = 41767560.

The previous prime is 91988497. The next prime is 91988537. The reversal of 91988534 is 43588919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91988537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26597 + ... + 29855.

It is an arithmetic number, because the mean of its divisors is an integer number (9418140).

Almost surely, 2^91988534 is an apocalyptic number.

91988534 is a deficient number, since it is larger than the sum of its proper divisors (58701706).

91988534 is a wasteful number, since it uses less digits than its factorization.

91988534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4555.

The product of its digits is 311040, while the sum is 47.

The square root of 91988534 is about 9591.0653214333. The cubic root of 91988534 is about 451.4169885572.

It can be divided in two parts, 919885 and 34, that added together give a palindrome (919919).

The spelling of 91988534 in words is "ninety-one million, nine hundred eighty-eight thousand, five hundred thirty-four".