97911899 has 2 divisors, whose sum is σ = 97911900. Its totient is φ = 97911898.

The previous prime is 97911881. The next prime is 97911929. The reversal of 97911899 is 99811979.

It is a weak prime.

It is an emirp because it is prime and its reverse (99811979) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97911899 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97911899.

It is not a weakly prime, because it can be changed into another prime (97911839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48955949 + 48955950.

It is an arithmetic number, because the mean of its divisors is an integer number (48955950).

Almost surely, 2^97911899 is an apocalyptic number.

97911899 is a deficient number, since it is larger than the sum of its proper divisors (1).

97911899 is an equidigital number, since it uses as much as digits as its factorization.

97911899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 53.

The square root of 97911899 is about 9895.0441636205. The cubic root of 97911899 is about 460.9054299449.

The spelling of 97911899 in words is "ninety-seven million, nine hundred eleven thousand, eight hundred ninety-nine".