128311723 has 2 divisors, whose sum is σ = 128311724. Its totient is φ = 128311722.

The previous prime is 128311709. The next prime is 128311727. The reversal of 128311723 is 327113821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128311723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128311691 and 128311700.

It is not a weakly prime, because it can be changed into another prime (128311727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64155861 + 64155862.

It is an arithmetic number, because the mean of its divisors is an integer number (64155862).

Almost surely, 2^128311723 is an apocalyptic number.

128311723 is a deficient number, since it is larger than the sum of its proper divisors (1).

128311723 is an equidigital number, since it uses as much as digits as its factorization.

128311723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 28.

The square root of 128311723 is about 11327.4764621252. The cubic root of 128311723 is about 504.3771991006.

The spelling of 128311723 in words is "one hundred twenty-eight million, three hundred eleven thousand, seven hundred twenty-three".