99789901 has 2 divisors, whose sum is σ = 99789902. Its totient is φ = 99789900.

The previous prime is 99789857. The next prime is 99789931. The reversal of 99789901 is 10998799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83997225 + 15792676 = 9165^2 + 3974^2 .

It is a cyclic number.

It is not a de Polignac number, because 99789901 - 2⁷ = 99789773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99789931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49894950 + 49894951.

It is an arithmetic number, because the mean of its divisors is an integer number (49894951).

Almost surely, 2^99789901 is an apocalyptic number.

It is an amenable number.

99789901 is a deficient number, since it is larger than the sum of its proper divisors (1).

99789901 is an equidigital number, since it uses as much as digits as its factorization.

99789901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 52.

The square root of 99789901 is about 9989.4895264973. The cubic root of 99789901 is about 463.8335910521.

The spelling of 99789901 in words is "ninety-nine million, seven hundred eighty-nine thousand, nine hundred one".