97999919 has 2 divisors, whose sum is σ = 97999920. Its totient is φ = 97999918.

The previous prime is 97999879. The next prime is 97999927. The reversal of 97999919 is 91999979.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (91999979) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97999919 - 2¹² = 97995823 is a prime.

It is a super-2 number, since 2×97999919² = 19207968248013122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97999949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48999959 + 48999960.

It is an arithmetic number, because the mean of its divisors is an integer number (48999960).

Almost surely, 2^97999919 is an apocalyptic number.

97999919 is a deficient number, since it is larger than the sum of its proper divisors (1).

97999919 is an equidigital number, since it uses as much as digits as its factorization.

97999919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3720087, while the sum is 62.

The square root of 97999919 is about 9899.4908454930. The cubic root of 97999919 is about 461.0435021836.

The spelling of 97999919 in words is "ninety-seven million, nine hundred ninety-nine thousand, nine hundred nineteen".