97857811 has 2 divisors, whose sum is σ = 97857812. Its totient is φ = 97857810.

The previous prime is 97857779. The next prime is 97857821. The reversal of 97857811 is 11875879.

It is a strong prime.

It is an emirp because it is prime and its reverse (11875879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97857811 - 2⁵ = 97857779 is a prime.

It is not a weakly prime, because it can be changed into another prime (97857821) 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, 48928905 + 48928906.

It is an arithmetic number, because the mean of its divisors is an integer number (48928906).

Almost surely, 2^97857811 is an apocalyptic number.

97857811 is a deficient number, since it is larger than the sum of its proper divisors (1).

97857811 is an equidigital number, since it uses as much as digits as its factorization.

97857811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 46.

The square root of 97857811 is about 9892.3107007413. The cubic root of 97857811 is about 460.8205439572.

The spelling of 97857811 in words is "ninety-seven million, eight hundred fifty-seven thousand, eight hundred eleven".