91815225284 has 6 divisors (see below), whose sum is σ = 160676644254. Its totient is φ = 45907612640.

The previous prime is 91815225283. The next prime is 91815225311. The reversal of 91815225284 is 48252251819.

It can be written as a sum of positive squares in only one way, i.e., 91621236100 + 193989184 = 302690^2 + 13928^2 .

It is not an unprimeable number, because it can be changed into a prime (91815225283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11476903157 + ... + 11476903164.

It is an arithmetic number, because the mean of its divisors is an integer number (26779440709).

Almost surely, 2^91815225284 is an apocalyptic number.

It is an amenable number.

91815225284 is a deficient number, since it is larger than the sum of its proper divisors (68861418970).

91815225284 is a wasteful number, since it uses less digits than its factorization.

91815225284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22953806325 (or 22953806323 counting only the distinct ones).

The product of its digits is 460800, while the sum is 47.

The spelling of 91815225284 in words is "ninety-one billion, eight hundred fifteen million, two hundred twenty-five thousand, two hundred eighty-four".