128137897 has 2 divisors, whose sum is σ = 128137898. Its totient is φ = 128137896.

The previous prime is 128137859. The next prime is 128137901. The reversal of 128137897 is 798731821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124121881 + 4016016 = 11141^2 + 2004^2 .

It is a cyclic number.

It is not a de Polignac number, because 128137897 - 2¹¹ = 128135849 is a prime.

It is not a weakly prime, because it can be changed into another prime (128137817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64068948 + 64068949.

It is an arithmetic number, because the mean of its divisors is an integer number (64068949).

Almost surely, 2^128137897 is an apocalyptic number.

It is an amenable number.

128137897 is a deficient number, since it is larger than the sum of its proper divisors (1).

128137897 is an equidigital number, since it uses as much as digits as its factorization.

128137897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 46.

The square root of 128137897 is about 11319.8011024929. The cubic root of 128137897 is about 504.1493334781.

The spelling of 128137897 in words is "one hundred twenty-eight million, one hundred thirty-seven thousand, eight hundred ninety-seven".