99997873 has 2 divisors, whose sum is σ = 99997874. Its totient is φ = 99997872.

The previous prime is 99997871. The next prime is 99997879. The reversal of 99997873 is 37879999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97476129 + 2521744 = 9873^2 + 1588^2 .

It is an emirp because it is prime and its reverse (37879999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99997873 - 2¹ = 99997871 is a prime.

Together with 99997871, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (99997871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49998936 + 49998937.

It is an arithmetic number, because the mean of its divisors is an integer number (49998937).

Almost surely, 2^99997873 is an apocalyptic number.

It is an amenable number.

99997873 is a deficient number, since it is larger than the sum of its proper divisors (1).

99997873 is an equidigital number, since it uses as much as digits as its factorization.

99997873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7715736, while the sum is 61.

The square root of 99997873 is about 9999.8936494345. The cubic root of 99997873 is about 464.1555924515.

The spelling of 99997873 in words is "ninety-nine million, nine hundred ninety-seven thousand, eight hundred seventy-three".