3161281 has 4 divisors (see below), whose sum is σ = 3298752. Its totient is φ = 3023812.

The previous prime is 3161273. The next prime is 3161293. The reversal of 3161281 is 1821613.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3161281 - 2³ = 3161273 is a prime.

It is a super-2 number, since 2×3161281² = 19987395121922, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (3161681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68701 + ... + 68746.

It is an arithmetic number, because the mean of its divisors is an integer number (824688).

Almost surely, 2^3161281 is an apocalyptic number.

It is an amenable number.

3161281 is a deficient number, since it is larger than the sum of its proper divisors (137471).

3161281 is a wasteful number, since it uses less digits than its factorization.

3161281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137470.

The product of its digits is 288, while the sum is 22.

The square root of 3161281 is about 1777.9991563553. Note that the first 3 decimals coincide. The cubic root of 3161281 is about 146.7645048529.

Adding to 3161281 its reverse (1821613), we get a palindrome (4982894).

The spelling of 3161281 in words is "three million, one hundred sixty-one thousand, two hundred eighty-one".