50128681 has 2 divisors, whose sum is σ = 50128682. Its totient is φ = 50128680.

The previous prime is 50128657. The next prime is 50128703. The reversal of 50128681 is 18682105.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41718681 + 8410000 = 6459^2 + 2900^2 .

It is a cyclic number.

It is not a de Polignac number, because 50128681 - 2²³ = 41740073 is a prime.

It is a super-2 number, since 2×50128681² = 5025769317599522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (50128601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25064340 + 25064341.

It is an arithmetic number, because the mean of its divisors is an integer number (25064341).

Almost surely, 2^50128681 is an apocalyptic number.

It is an amenable number.

50128681 is a deficient number, since it is larger than the sum of its proper divisors (1).

50128681 is an equidigital number, since it uses as much as digits as its factorization.

50128681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 50128681 is about 7080.1610857381. The cubic root of 50128681 is about 368.7189223641.

The spelling of 50128681 in words is "fifty million, one hundred twenty-eight thousand, six hundred eighty-one".