97811009 has 2 divisors, whose sum is σ = 97811010. Its totient is φ = 97811008.

The previous prime is 97811003. The next prime is 97811027. The reversal of 97811009 is 90011879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88642225 + 9168784 = 9415^2 + 3028^2 .

It is a cyclic number.

It is not a de Polignac number, because 97811009 - 2¹² = 97806913 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 97811009.

It is not a weakly prime, because it can be changed into another prime (97811003) 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, 48905504 + 48905505.

It is an arithmetic number, because the mean of its divisors is an integer number (48905505).

Almost surely, 2^97811009 is an apocalyptic number.

It is an amenable number.

97811009 is a deficient number, since it is larger than the sum of its proper divisors (1).

97811009 is an equidigital number, since it uses as much as digits as its factorization.

97811009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 97811009 is about 9889.9448431222. The cubic root of 97811009 is about 460.7470674097.

The spelling of 97811009 in words is "ninety-seven million, eight hundred eleven thousand, nine".