128624081 has 2 divisors, whose sum is σ = 128624082. Its totient is φ = 128624080.

The previous prime is 128624059. The next prime is 128624107. The reversal of 128624081 is 180426821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125238481 + 3385600 = 11191^2 + 1840^2 .

It is an emirp because it is prime and its reverse (180426821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128624081 - 2¹⁰ = 128623057 is a prime.

It is a super-2 number, since 2×128624081² = 33088308426189122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128624681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64312040 + 64312041.

It is an arithmetic number, because the mean of its divisors is an integer number (64312041).

Almost surely, 2^128624081 is an apocalyptic number.

It is an amenable number.

128624081 is a deficient number, since it is larger than the sum of its proper divisors (1).

128624081 is an equidigital number, since it uses as much as digits as its factorization.

128624081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 128624081 is about 11341.2557064904. The cubic root of 128624081 is about 504.7861474030.

The spelling of 128624081 in words is "one hundred twenty-eight million, six hundred twenty-four thousand, eighty-one".