91228532 has 12 divisors (see below), whose sum is σ = 163965060. Its totient is φ = 44381376.

The previous prime is 91228513. The next prime is 91228541. The reversal of 91228532 is 23582219.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 76143076 + 15085456 = 8726^2 + 3884^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 308057 + ... + 308352.

It is an arithmetic number, because the mean of its divisors is an integer number (13663755).

Almost surely, 2^91228532 is an apocalyptic number.

It is an amenable number.

91228532 is a deficient number, since it is larger than the sum of its proper divisors (72736528).

91228532 is a wasteful number, since it uses less digits than its factorization.

91228532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616450 (or 616448 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 91228532 is about 9551.3628346954. The cubic root of 91228532 is about 450.1703585437.

The spelling of 91228532 in words is "ninety-one million, two hundred twenty-eight thousand, five hundred thirty-two".