128395031 has 2 divisors, whose sum is σ = 128395032. Its totient is φ = 128395030.

The previous prime is 128395021. The next prime is 128395037. The reversal of 128395031 is 130593821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128395031 is a prime.

It is a super-2 number, since 2×128395031² = 32970567970981922, which contains 22 as substring.

It is equal to p_7292147 and since 128395031 and 7292147 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128395037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64197515 + 64197516.

It is an arithmetic number, because the mean of its divisors is an integer number (64197516).

Almost surely, 2^128395031 is an apocalyptic number.

128395031 is a deficient number, since it is larger than the sum of its proper divisors (1).

128395031 is an equidigital number, since it uses as much as digits as its factorization.

128395031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 128395031 is about 11331.1531187254. The cubic root of 128395031 is about 504.4863332319.

The spelling of 128395031 in words is "one hundred twenty-eight million, three hundred ninety-five thousand, thirty-one".