128707811 has 2 divisors, whose sum is σ = 128707812. Its totient is φ = 128707810.

The previous prime is 128707781. The next prime is 128707823. The reversal of 128707811 is 118707821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128707811 is a prime.

It is a super-2 number, since 2×128707811² = 33131401224823442, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128707841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64353905 + 64353906.

It is an arithmetic number, because the mean of its divisors is an integer number (64353906).

Almost surely, 2^128707811 is an apocalyptic number.

128707811 is a deficient number, since it is larger than the sum of its proper divisors (1).

128707811 is an equidigital number, since it uses as much as digits as its factorization.

128707811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 35.

The square root of 128707811 is about 11344.9464961277. The cubic root of 128707811 is about 504.8956566435.

The spelling of 128707811 in words is "one hundred twenty-eight million, seven hundred seven thousand, eight hundred eleven".