3123281 has 16 divisors (see below), whose sum is σ = 3793920. Its totient is φ = 2514240.

The previous prime is 3123233. The next prime is 3123287. The reversal of 3123281 is 1823213.

3123281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 3123281 - 2⁶ = 3123217 is a prime.

It is a super-2 number, since 2×3123281² = 19509768409922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3123287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7835 + ... + 8223.

It is an arithmetic number, because the mean of its divisors is an integer number (237120).

Almost surely, 2^3123281 is an apocalyptic number.

3123281 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3123281 is a deficient number, since it is larger than the sum of its proper divisors (670639).

3123281 is a wasteful number, since it uses less digits than its factorization.

3123281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464.

The product of its digits is 288, while the sum is 20.

The square root of 3123281 is about 1767.2806794621. The cubic root of 3123281 is about 146.1740745991.

Adding to 3123281 its reverse (1823213), we get a palindrome (4946494).

It can be divided in two parts, 31232 and 81, that added together give a palindrome (31313).

The spelling of 3123281 in words is "three million, one hundred twenty-three thousand, two hundred eighty-one".