128074981 has 4 divisors (see below), whose sum is σ = 132206464. Its totient is φ = 123943500.

The previous prime is 128074967. The next prime is 128074987. The reversal of 128074981 is 189470821.

It is a happy number.

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: 189470821 = 37 ⋅5120833.

It is a cyclic number.

It is not a de Polignac number, because 128074981 - 2⁵ = 128074949 is a prime.

It is a super-2 number, since 2×128074981² = 32806401516300722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128074987) 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, 2065695 + ... + 2065756.

It is an arithmetic number, because the mean of its divisors is an integer number (33051616).

Almost surely, 2^128074981 is an apocalyptic number.

It is an amenable number.

128074981 is a deficient number, since it is larger than the sum of its proper divisors (4131483).

128074981 is an equidigital number, since it uses as much as digits as its factorization.

128074981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4131482.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 128074981 is about 11317.0217371886. The cubic root of 128074981 is about 504.0668071452.

The spelling of 128074981 in words is "one hundred twenty-eight million, seventy-four thousand, nine hundred eighty-one".