3131281 has 8 divisors (see below), whose sum is σ = 3386880. Its totient is φ = 2883648.

The previous prime is 3131267. The next prime is 3131299. The reversal of 3131281 is 1821313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3131281 - 2⁷ = 3131153 is a prime.

It is a super-2 number, since 2×3131281² = 19609841401922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131221) 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 7 ways as a sum of consecutive naturals, for example, 1161 + ... + 2758.

It is an arithmetic number, because the mean of its divisors is an integer number (423360).

Almost surely, 2^3131281 is an apocalyptic number.

It is an amenable number.

3131281 is a deficient number, since it is larger than the sum of its proper divisors (255599).

3131281 is a wasteful number, since it uses less digits than its factorization.

3131281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3983.

The product of its digits is 144, while the sum is 19.

The square root of 3131281 is about 1769.5425962661. The cubic root of 3131281 is about 146.2987720550.

Adding to 3131281 its reverse (1821313), we get a palindrome (4952594).

The spelling of 3131281 in words is "three million, one hundred thirty-one thousand, two hundred eighty-one".