91228641 has 12 divisors (see below), whose sum is σ = 141497712. Its totient is φ = 52130568.

The previous prime is 91228639. The next prime is 91228759. The reversal of 91228641 is 14682219.

It is not a de Polignac number, because 91228641 - 2¹ = 91228639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91228601) 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, 310155 + ... + 310448.

It is an arithmetic number, because the mean of its divisors is an integer number (11791476).

Almost surely, 2^91228641 is an apocalyptic number.

It is an amenable number.

91228641 is a deficient number, since it is larger than the sum of its proper divisors (50269071).

91228641 is a wasteful number, since it uses less digits than its factorization.

91228641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620620 (or 620613 counting only the distinct ones).

The product of its digits is 6912, while the sum is 33.

The square root of 91228641 is about 9551.3685406857. The cubic root of 91228641 is about 450.1705378317.

The spelling of 91228641 in words is "ninety-one million, two hundred twenty-eight thousand, six hundred forty-one".