91872226 has 16 divisors (see below), whose sum is σ = 142580088. Its totient is φ = 44368000.

The previous prime is 91872217. The next prime is 91872227. The reversal of 91872226 is 62227819.

It is a Cunningham number, because it is equal to 9585²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 88266025 + 3606201 = 9395^2 + 1899^2 .

It is a super-3 number, since 3×91872226³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (91872227) 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 in 7 ways as a sum of consecutive naturals, for example, 2736 + ... + 13828.

Almost surely, 2^91872226 is an apocalyptic number.

91872226 is a deficient number, since it is larger than the sum of its proper divisors (50707862).

91872226 is a wasteful number, since it uses less digits than its factorization.

91872226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11237.

The product of its digits is 24192, while the sum is 37.

The square root of 91872226 is about 9585.0000521648. Note that the first 4 decimals coincide. The cubic root of 91872226 is about 451.2266548697.

The spelling of 91872226 in words is "ninety-one million, eight hundred seventy-two thousand, two hundred twenty-six".