128149057 has 6 divisors (see below), whose sum is σ = 132721238. Its totient is φ = 123729312.

The previous prime is 128149037. The next prime is 128149061. The reversal of 128149057 is 750941821.

It can be written as a sum of positive squares in 3 ways, for example, as 23270976 + 104878081 = 4824^2 + 10241^2 .

It is not a de Polignac number, because 128149057 - 2²³ = 119760449 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128149027) 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 in 5 ways as a sum of consecutive naturals, for example, 75348 + ... + 77029.

Almost surely, 2^128149057 is an apocalyptic number.

It is an amenable number.

128149057 is a deficient number, since it is larger than the sum of its proper divisors (4572181).

128149057 is an equidigital number, since it uses as much as digits as its factorization.

128149057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152435 (or 152406 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 128149057 is about 11320.2940332838. The cubic root of 128149057 is about 504.1639691255.

The spelling of 128149057 in words is "one hundred twenty-eight million, one hundred forty-nine thousand, fifty-seven".