128142361 has 4 divisors (see below), whose sum is σ = 133713792. Its totient is φ = 122570932.

The previous prime is 128142353. The next prime is 128142367. The reversal of 128142361 is 163241821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 163241821 = 4657 ⋅35053.

It is a cyclic number.

It is not a de Polignac number, because 128142361 - 2³ = 128142353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128142367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2785681 + ... + 2785726.

It is an arithmetic number, because the mean of its divisors is an integer number (33428448).

Almost surely, 2^128142361 is an apocalyptic number.

It is an amenable number.

128142361 is a deficient number, since it is larger than the sum of its proper divisors (5571431).

128142361 is an equidigital number, since it uses as much as digits as its factorization.

128142361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5571430.

The product of its digits is 2304, while the sum is 28.

The square root of 128142361 is about 11319.9982773850. The cubic root of 128142361 is about 504.1551878390.

The spelling of 128142361 in words is "one hundred twenty-eight million, one hundred forty-two thousand, three hundred sixty-one".