128437013 has 2 divisors, whose sum is σ = 128437014. Its totient is φ = 128437012.

The previous prime is 128436949. The next prime is 128437019. The reversal of 128437013 is 310734821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128097124 + 339889 = 11318^2 + 583^2 .

It is a cyclic number.

It is not a de Polignac number, because 128437013 - 2⁶ = 128436949 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128437019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64218506 + 64218507.

It is an arithmetic number, because the mean of its divisors is an integer number (64218507).

Almost surely, 2^128437013 is an apocalyptic number.

It is an amenable number.

128437013 is a deficient number, since it is larger than the sum of its proper divisors (1).

128437013 is an equidigital number, since it uses as much as digits as its factorization.

128437013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 128437013 is about 11333.0054707478. The cubic root of 128437013 is about 504.5413120919.

The spelling of 128437013 in words is "one hundred twenty-eight million, four hundred thirty-seven thousand, thirteen".