91820153 has 2 divisors, whose sum is σ = 91820154. Its totient is φ = 91820152.

The previous prime is 91820149. The next prime is 91820159. The reversal of 91820153 is 35102819.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91546624 + 273529 = 9568^2 + 523^2 .

It is a cyclic number.

It is not a de Polignac number, because 91820153 - 2² = 91820149 is a prime.

It is not a weakly prime, because it can be changed into another prime (91820159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45910076 + 45910077.

It is an arithmetic number, because the mean of its divisors is an integer number (45910077).

Almost surely, 2^91820153 is an apocalyptic number.

It is an amenable number.

91820153 is a deficient number, since it is larger than the sum of its proper divisors (1).

91820153 is an equidigital number, since it uses as much as digits as its factorization.

91820153 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 91820153 is about 9582.2832874008. The cubic root of 91820153 is about 451.1413872928.

The spelling of 91820153 in words is "ninety-one million, eight hundred twenty thousand, one hundred fifty-three".