99257789 has 2 divisors, whose sum is σ = 99257790. Its totient is φ = 99257788.

The previous prime is 99257779. The next prime is 99257813. The reversal of 99257789 is 98775299.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60295225 + 38962564 = 7765^2 + 6242^2 .

It is a cyclic number.

It is not a de Polignac number, because 99257789 - 2⁴ = 99257773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99257759) 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 as a sum of consecutive naturals, namely, 49628894 + 49628895.

It is an arithmetic number, because the mean of its divisors is an integer number (49628895).

Almost surely, 2^99257789 is an apocalyptic number.

It is an amenable number.

99257789 is a deficient number, since it is larger than the sum of its proper divisors (1).

99257789 is an equidigital number, since it uses as much as digits as its factorization.

99257789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2857680, while the sum is 56.

The square root of 99257789 is about 9962.8203336204. The cubic root of 99257789 is about 463.0076844413.

The spelling of 99257789 in words is "ninety-nine million, two hundred fifty-seven thousand, seven hundred eighty-nine".