97680809 has 2 divisors, whose sum is σ = 97680810. Its totient is φ = 97680808.

The previous prime is 97680797. The next prime is 97680811. The reversal of 97680809 is 90808679.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88360000 + 9320809 = 9400^2 + 3053^2 .

It is a cyclic number.

It is not a de Polignac number, because 97680809 - 2⁸ = 97680553 is a prime.

Together with 97680811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (97680859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48840404 + 48840405.

It is an arithmetic number, because the mean of its divisors is an integer number (48840405).

Almost surely, 2^97680809 is an apocalyptic number.

It is an amenable number.

97680809 is a deficient number, since it is larger than the sum of its proper divisors (1).

97680809 is an equidigital number, since it uses as much as digits as its factorization.

97680809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 97680809 is about 9883.3602079455. The cubic root of 97680809 is about 460.5425372431.

It can be divided in two parts, 97680 and 809, that added together give a palindrome (98489).

The spelling of 97680809 in words is "ninety-seven million, six hundred eighty thousand, eight hundred nine".