128507213 has 2 divisors, whose sum is σ = 128507214. Its totient is φ = 128507212.

The previous prime is 128507209. The next prime is 128507219. The reversal of 128507213 is 312705821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123587689 + 4919524 = 11117^2 + 2218^2 .

It is an emirp because it is prime and its reverse (312705821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128507213 - 2² = 128507209 is a prime.

It is a Sophie Germain prime.

It is a Chen 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 (128507219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64253606 + 64253607.

It is an arithmetic number, because the mean of its divisors is an integer number (64253607).

Almost surely, 2^128507213 is an apocalyptic number.

It is an amenable number.

128507213 is a deficient number, since it is larger than the sum of its proper divisors (1).

128507213 is an equidigital number, since it uses as much as digits as its factorization.

128507213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 128507213 is about 11336.1021960813. The cubic root of 128507213 is about 504.6332179692.

The spelling of 128507213 in words is "one hundred twenty-eight million, five hundred seven thousand, two hundred thirteen".