128161723 has 2 divisors, whose sum is σ = 128161724. Its totient is φ = 128161722.

The previous prime is 128161697. The next prime is 128161739. The reversal of 128161723 is 327161821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128161723 - 2²⁵ = 94607291 is a prime.

It is a super-3 number, since 3×128161723³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (128161823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64080861 + 64080862.

It is an arithmetic number, because the mean of its divisors is an integer number (64080862).

Almost surely, 2^128161723 is an apocalyptic number.

128161723 is a deficient number, since it is larger than the sum of its proper divisors (1).

128161723 is an equidigital number, since it uses as much as digits as its factorization.

128161723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 31.

The square root of 128161723 is about 11320.8534572266. The cubic root of 128161723 is about 504.1805787690.

The spelling of 128161723 in words is "one hundred twenty-eight million, one hundred sixty-one thousand, seven hundred twenty-three".