3128542281 has 12 divisors (see below), whose sum is σ = 4519553220. Its totient is φ = 2085442080.

The previous prime is 3128542253. The next prime is 3128542303. The reversal of 3128542281 is 1822458213.

It is a happy number.

3128542281 is a `hidden beast` number, since 31 + 2 + 8 + 542 + 2 + 81 = 666.

3128542281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1756951056 + 1371591225 = 41916^2 + 37035^2 .

It is not a de Polignac number, because 3128542281 - 2⁶ = 3128542217 is a prime.

It is a super-2 number, since 2×3128542281² = 19575553608009365922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3128542381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85915 + ... + 116783.

It is an arithmetic number, because the mean of its divisors is an integer number (376629435).

Almost surely, 2^3128542281 is an apocalyptic number.

It is an amenable number.

3128542281 is a deficient number, since it is larger than the sum of its proper divisors (1391010939).

3128542281 is a wasteful number, since it uses less digits than its factorization.

3128542281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42136 (or 42133 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 3128542281 is about 55933.3735885831. The cubic root of 3128542281 is about 1462.5610707787.

The spelling of 3128542281 in words is "three billion, one hundred twenty-eight million, five hundred forty-two thousand, two hundred eighty-one".