97999879 has 2 divisors, whose sum is σ = 97999880. Its totient is φ = 97999878.

The previous prime is 97999877. The next prime is 97999919. The reversal of 97999879 is 97899979.

It is a weak prime.

It is an emirp because it is prime and its reverse (97899979) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97999879 - 2¹ = 97999877 is a prime.

Together with 97999877, 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 (97999877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48999939 + 48999940.

It is an arithmetic number, because the mean of its divisors is an integer number (48999940).

Almost surely, 2^97999879 is an apocalyptic number.

97999879 is a deficient number, since it is larger than the sum of its proper divisors (1).

97999879 is an equidigital number, since it uses as much as digits as its factorization.

97999879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23147208, while the sum is 67.

The square root of 97999879 is about 9899.4888251869. The cubic root of 97999879 is about 461.0434394565.

The spelling of 97999879 in words is "ninety-seven million, nine hundred ninety-nine thousand, eight hundred seventy-nine".