128155073 has 4 divisors (see below), whose sum is σ = 129133488. Its totient is φ = 127176660.

The previous prime is 128155063. The next prime is 128155099. The reversal of 128155073 is 370551821.

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: 370551821 = 29 ⋅12777649.

It is a cyclic number.

It is not a de Polignac number, because 128155073 - 2¹² = 128150977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128155003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 489011 + ... + 489272.

It is an arithmetic number, because the mean of its divisors is an integer number (32283372).

Almost surely, 2^128155073 is an apocalyptic number.

It is an amenable number.

128155073 is a deficient number, since it is larger than the sum of its proper divisors (978415).

128155073 is an equidigital number, since it uses as much as digits as its factorization.

128155073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978414.

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 128155073 is about 11320.5597476450. The cubic root of 128155073 is about 504.1718583837.

The spelling of 128155073 in words is "one hundred twenty-eight million, one hundred fifty-five thousand, seventy-three".