128207881 has 2 divisors, whose sum is σ = 128207882. Its totient is φ = 128207880.

The previous prime is 128207851. The next prime is 128207921. The reversal of 128207881 is 188702821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128051856 + 156025 = 11316^2 + 395^2 .

It is an emirp because it is prime and its reverse (188702821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128207881 - 2¹³ = 128199689 is a prime.

It is a super-2 number, since 2×128207881² = 32874521501020322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128207881.

It is not a weakly prime, because it can be changed into another prime (128207831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64103940 + 64103941.

It is an arithmetic number, because the mean of its divisors is an integer number (64103941).

Almost surely, 2^128207881 is an apocalyptic number.

It is an amenable number.

128207881 is a deficient number, since it is larger than the sum of its proper divisors (1).

128207881 is an equidigital number, since it uses as much as digits as its factorization.

128207881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14336, while the sum is 37.

The square root of 128207881 is about 11322.8919009235. The cubic root of 128207881 is about 504.2410991109.

The spelling of 128207881 in words is "one hundred twenty-eight million, two hundred seven thousand, eight hundred eighty-one".