991888153 has 2 divisors, whose sum is σ = 991888154. Its totient is φ = 991888152.

The previous prime is 991888129. The next prime is 991888199. The reversal of 991888153 is 351888199.

991888153 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 588159504 + 403728649 = 24252^2 + 20093^2 .

It is a cyclic number.

It is not a de Polignac number, because 991888153 - 2⁹ = 991887641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 991888153.

It is not a weakly prime, because it can be changed into another prime (991888553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495944076 + 495944077.

It is an arithmetic number, because the mean of its divisors is an integer number (495944077).

Almost surely, 2^991888153 is an apocalyptic number.

It is an amenable number.

991888153 is a deficient number, since it is larger than the sum of its proper divisors (1).

991888153 is an equidigital number, since it uses as much as digits as its factorization.

991888153 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 52.

The square root of 991888153 is about 31494.2558730953. The cubic root of 991888153 is about 997.2887065314.

The spelling of 991888153 in words is "nine hundred ninety-one million, eight hundred eighty-eight thousand, one hundred fifty-three".