99138229 has 2 divisors, whose sum is σ = 99138230. Its totient is φ = 99138228.

The previous prime is 99138227. The next prime is 99138233. The reversal of 99138229 is 92283199.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98545329 + 592900 = 9927^2 + 770^2 .

It is a cyclic number.

It is not a de Polignac number, because 99138229 - 2¹ = 99138227 is a prime.

Together with 99138227, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99138227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49569114 + 49569115.

It is an arithmetic number, because the mean of its divisors is an integer number (49569115).

Almost surely, 2^99138229 is an apocalyptic number.

It is an amenable number.

99138229 is a deficient number, since it is larger than the sum of its proper divisors (1).

99138229 is an equidigital number, since it uses as much as digits as its factorization.

99138229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 43.

The square root of 99138229 is about 9956.8182166795. The cubic root of 99138229 is about 462.8217059542.

The spelling of 99138229 in words is "ninety-nine million, one hundred thirty-eight thousand, two hundred twenty-nine".