97189889 has 2 divisors, whose sum is σ = 97189890. Its totient is φ = 97189888.

The previous prime is 97189879. The next prime is 97189903. The reversal of 97189889 is 98898179.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95394289 + 1795600 = 9767^2 + 1340^2 .

It is an emirp because it is prime and its reverse (98898179) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97189889 - 2⁸ = 97189633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (97189819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48594944 + 48594945.

It is an arithmetic number, because the mean of its divisors is an integer number (48594945).

It is a Proth number, since it is equal to 1483 ⋅ 2¹⁶ + 1 and 1483 < 2¹⁶.

Almost surely, 2^97189889 is an apocalyptic number.

It is an amenable number.

97189889 is a deficient number, since it is larger than the sum of its proper divisors (1).

97189889 is an equidigital number, since it uses as much as digits as its factorization.

97189889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 59.

The square root of 97189889 is about 9858.4932418702. The cubic root of 97189889 is about 459.7697161782.

The spelling of 97189889 in words is "ninety-seven million, one hundred eighty-nine thousand, eight hundred eighty-nine".