97687488920209 has 2 divisors, whose sum is σ = 97687488920210. Its totient is φ = 97687488920208.

The previous prime is 97687488920179. The next prime is 97687488920233. The reversal of 97687488920209 is 90202988478679.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89845696817809 + 7841792102400 = 9478697^2 + 2800320^2 .

It is a cyclic number.

It is not a de Polignac number, because 97687488920209 - 2²¹ = 97687486823057 is a prime.

It is a super-2 number, since 2×97687488920209² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (97687488950209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48843744460104 + 48843744460105.

It is an arithmetic number, because the mean of its divisors is an integer number (48843744460105).

Almost surely, 2^{97687488920209} is an apocalyptic number.

It is an amenable number.

97687488920209 is a deficient number, since it is larger than the sum of its proper divisors (1).

97687488920209 is an equidigital number, since it uses as much as digits as its factorization.

97687488920209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1755758592, while the sum is 79.

The spelling of 97687488920209 in words is "ninety-seven trillion, six hundred eighty-seven billion, four hundred eighty-eight million, nine hundred twenty thousand, two hundred nine".