99870929 has 2 divisors, whose sum is σ = 99870930. Its totient is φ = 99870928.

The previous prime is 99870919. The next prime is 99870949. The reversal of 99870929 is 92907899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50027329 + 49843600 = 7073^2 + 7060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99870929 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (99870919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49935464 + 49935465.

It is an arithmetic number, because the mean of its divisors is an integer number (49935465).

Almost surely, 2^99870929 is an apocalyptic number.

It is an amenable number.

99870929 is a deficient number, since it is larger than the sum of its proper divisors (1).

99870929 is an equidigital number, since it uses as much as digits as its factorization.

99870929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 53.

The square root of 99870929 is about 9993.5443662396. The cubic root of 99870929 is about 463.9590992114.

The spelling of 99870929 in words is "ninety-nine million, eight hundred seventy thousand, nine hundred twenty-nine".