97189555221509 has 2 divisors, whose sum is σ = 97189555221510. Its totient is φ = 97189555221508.

The previous prime is 97189555221497. The next prime is 97189555221589. The reversal of 97189555221509 is 90512255598179.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85681496344900 + 11508058876609 = 9256430^2 + 3392353^2 .

It is a cyclic number.

It is not a de Polignac number, because 97189555221509 - 2¹² = 97189555217413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97189555221589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48594777610754 + 48594777610755.

It is an arithmetic number, because the mean of its divisors is an integer number (48594777610755).

Almost surely, 2^{97189555221509} is an apocalyptic number.

It is an amenable number.

97189555221509 is a deficient number, since it is larger than the sum of its proper divisors (1).

97189555221509 is an equidigital number, since it uses as much as digits as its factorization.

97189555221509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060000, while the sum is 68.

The spelling of 97189555221509 in words is "ninety-seven trillion, one hundred eighty-nine billion, five hundred fifty-five million, two hundred twenty-one thousand, five hundred nine".