128906137 has 2 divisors, whose sum is σ = 128906138. Its totient is φ = 128906136.

The previous prime is 128906119. The next prime is 128906147. The reversal of 128906137 is 731609821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127780416 + 1125721 = 11304^2 + 1061^2 .

It is a cyclic number.

It is not a de Polignac number, because 128906137 - 2¹¹ = 128904089 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 128906096 and 128906105.

It is not a weakly prime, because it can be changed into another prime (128906147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64453068 + 64453069.

It is an arithmetic number, because the mean of its divisors is an integer number (64453069).

Almost surely, 2^128906137 is an apocalyptic number.

It is an amenable number.

128906137 is a deficient number, since it is larger than the sum of its proper divisors (1).

128906137 is an equidigital number, since it uses as much as digits as its factorization.

128906137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 128906137 is about 11353.6838515083. The cubic root of 128906137 is about 505.1548549704.

The spelling of 128906137 in words is "one hundred twenty-eight million, nine hundred six thousand, one hundred thirty-seven".