3121081 has 4 divisors (see below), whose sum is σ = 3304692. Its totient is φ = 2937472.

The previous prime is 3121057. The next prime is 3121087. The reversal of 3121081 is 1801213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1946025 + 1175056 = 1395^2 + 1084^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121081 - 2¹⁹ = 2596793 is a prime.

It is a super-2 number, since 2×3121081² = 19482293217122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3121087) 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, 91780 + ... + 91813.

It is an arithmetic number, because the mean of its divisors is an integer number (826173).

Almost surely, 2^3121081 is an apocalyptic number.

It is an amenable number.

3121081 is a deficient number, since it is larger than the sum of its proper divisors (183611).

3121081 is a wasteful number, since it uses less digits than its factorization.

3121081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183610.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 3121081 is about 1766.6581446335. The cubic root of 3121081 is about 146.1397454753.

Adding to 3121081 its reverse (1801213), we get a palindrome (4922294).

It can be divided in two parts, 31 and 21081, that added together give a palindrome (21112).

The spelling of 3121081 in words is "three million, one hundred twenty-one thousand, eighty-one".