128124131 has 2 divisors, whose sum is σ = 128124132. Its totient is φ = 128124130.

The previous prime is 128124127. The next prime is 128124149. The reversal of 128124131 is 131421821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128124131 - 2² = 128124127 is a prime.

It is a super-2 number, since 2×128124131² = 32831585889010322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128124097 and 128124106.

It is not a weakly prime, because it can be changed into another prime (128174131) 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 as a sum of consecutive naturals, namely, 64062065 + 64062066.

It is an arithmetic number, because the mean of its divisors is an integer number (64062066).

Almost surely, 2^128124131 is an apocalyptic number.

128124131 is a deficient number, since it is larger than the sum of its proper divisors (1).

128124131 is an equidigital number, since it uses as much as digits as its factorization.

128124131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 23.

The square root of 128124131 is about 11319.1930366082. The cubic root of 128124131 is about 504.1312790528.

Adding to 128124131 its reverse (131421821), we get a palindrome (259545952).

The spelling of 128124131 in words is "one hundred twenty-eight million, one hundred twenty-four thousand, one hundred thirty-one".