99138929 has 2 divisors, whose sum is σ = 99138930. Its totient is φ = 99138928.

The previous prime is 99138913. The next prime is 99138953. The reversal of 99138929 is 92983199.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63760225 + 35378704 = 7985^2 + 5948^2 .

It is an emirp because it is prime and its reverse (92983199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99138929 - 2⁴ = 99138913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99138959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49569464 + 49569465.

It is an arithmetic number, because the mean of its divisors is an integer number (49569465).

Almost surely, 2^99138929 is an apocalyptic number.

It is an amenable number.

99138929 is a deficient number, since it is larger than the sum of its proper divisors (1).

99138929 is an equidigital number, since it uses as much as digits as its factorization.

99138929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 50.

The square root of 99138929 is about 9956.8533684091. The cubic root of 99138929 is about 462.8227952562.

The spelling of 99138929 in words is "ninety-nine million, one hundred thirty-eight thousand, nine hundred twenty-nine".