128723597 has 2 divisors, whose sum is σ = 128723598. Its totient is φ = 128723596.

The previous prime is 128723587. The next prime is 128723599. The reversal of 128723597 is 795327821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98922916 + 29800681 = 9946^2 + 5459^2 .

It is a cyclic number.

It is not a de Polignac number, because 128723597 - 2⁶ = 128723533 is a prime.

Together with 128723599, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128723599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64361798 + 64361799.

It is an arithmetic number, because the mean of its divisors is an integer number (64361799).

Almost surely, 2^128723597 is an apocalyptic number.

It is an amenable number.

128723597 is a deficient number, since it is larger than the sum of its proper divisors (1).

128723597 is an equidigital number, since it uses as much as digits as its factorization.

128723597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 44.

The square root of 128723597 is about 11345.6422030663. The cubic root of 128723597 is about 504.9162976000.

The spelling of 128723597 in words is "one hundred twenty-eight million, seven hundred twenty-three thousand, five hundred ninety-seven".