128311877 has 2 divisors, whose sum is σ = 128311878. Its totient is φ = 128311876.

The previous prime is 128311847. The next prime is 128311907. The reversal of 128311877 is 778113821.

It is a balanced prime because it is at equal distance from previous prime (128311847) and next prime (128311907).

It can be written as a sum of positive squares in only one way, i.e., 106791556 + 21520321 = 10334^2 + 4639^2 .

It is a cyclic number.

It is not a de Polignac number, because 128311877 - 2⁸ = 128311621 is a prime.

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 128311877.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128311847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64155938 + 64155939.

It is an arithmetic number, because the mean of its divisors is an integer number (64155939).

Almost surely, 2^128311877 is an apocalyptic number.

It is an amenable number.

128311877 is a deficient number, since it is larger than the sum of its proper divisors (1).

128311877 is an equidigital number, since it uses as much as digits as its factorization.

128311877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18816, while the sum is 38.

The square root of 128311877 is about 11327.4832597537. The cubic root of 128311877 is about 504.3774008854.

The spelling of 128311877 in words is "one hundred twenty-eight million, three hundred eleven thousand, eight hundred seventy-seven".