91228801 has 2 divisors, whose sum is σ = 91228802. Its totient is φ = 91228800.

The previous prime is 91228771. The next prime is 91228807. The reversal of 91228801 is 10882219.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80568576 + 10660225 = 8976^2 + 3265^2 .

It is a cyclic number.

It is not a de Polignac number, because 91228801 - 2⁵ = 91228769 is a prime.

It is not a weakly prime, because it can be changed into another prime (91228807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45614400 + 45614401.

It is an arithmetic number, because the mean of its divisors is an integer number (45614401).

Almost surely, 2^91228801 is an apocalyptic number.

It is an amenable number.

91228801 is a deficient number, since it is larger than the sum of its proper divisors (1).

91228801 is an equidigital number, since it uses as much as digits as its factorization.

91228801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 91228801 is about 9551.3769164451. The cubic root of 91228801 is about 450.1708010066.

It can be divided in two parts, 91228 and 801, that added together give a palindrome (92029).

The spelling of 91228801 in words is "ninety-one million, two hundred twenty-eight thousand, eight hundred one".