3111281 has 2 divisors, whose sum is σ = 3111282. Its totient is φ = 3111280.

The previous prime is 3111271. The next prime is 3111287. The reversal of 3111281 is 1821113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2958400 + 152881 = 1720^2 + 391^2 .

It is a cyclic number.

It is not a de Polignac number, because 3111281 - 2⁶ = 3111217 is a prime.

It is a super-2 number, since 2×3111281² = 19360138921922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3111287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1555640 + 1555641.

It is an arithmetic number, because the mean of its divisors is an integer number (1555641).

Almost surely, 2^3111281 is an apocalyptic number.

It is an amenable number.

3111281 is a deficient number, since it is larger than the sum of its proper divisors (1).

3111281 is an equidigital number, since it uses as much as digits as its factorization.

3111281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48, while the sum is 17.

The square root of 3111281 is about 1763.8823656922. The cubic root of 3111281 is about 145.9866285371.

Adding to 3111281 its reverse (1821113), we get a palindrome (4932394).

The spelling of 3111281 in words is "three million, one hundred eleven thousand, two hundred eighty-one".