128395651 has 4 divisors (see below), whose sum is σ = 130312072. Its totient is φ = 126479232.

The previous prime is 128395639. The next prime is 128395691. The reversal of 128395651 is 156593821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 156593821 = 23 ⋅6808427.

It is a cyclic number.

It is not a de Polignac number, because 128395651 - 2⁷ = 128395523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128395691) 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, 958110 + ... + 958243.

It is an arithmetic number, because the mean of its divisors is an integer number (32578018).

Almost surely, 2^128395651 is an apocalyptic number.

128395651 is a deficient number, since it is larger than the sum of its proper divisors (1916421).

128395651 is an equidigital number, since it uses as much as digits as its factorization.

128395651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916420.

The product of its digits is 64800, while the sum is 40.

The square root of 128395651 is about 11331.1804768965. The cubic root of 128395651 is about 504.4871452598.

The spelling of 128395651 in words is "one hundred twenty-eight million, three hundred ninety-five thousand, six hundred fifty-one".