128836871 has 2 divisors, whose sum is σ = 128836872. Its totient is φ = 128836870.

The previous prime is 128836867. The next prime is 128836907. The reversal of 128836871 is 178638821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128836871 - 2² = 128836867 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128832871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64418435 + 64418436.

It is an arithmetic number, because the mean of its divisors is an integer number (64418436).

Almost surely, 2^128836871 is an apocalyptic number.

128836871 is a deficient number, since it is larger than the sum of its proper divisors (1).

128836871 is an equidigital number, since it uses as much as digits as its factorization.

128836871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 44.

The square root of 128836871 is about 11350.6330660453. The cubic root of 128836871 is about 505.0643593431.

The spelling of 128836871 in words is "one hundred twenty-eight million, eight hundred thirty-six thousand, eight hundred seventy-one".