3121212481 has 2 divisors, whose sum is σ = 3121212482. Its totient is φ = 3121212480.

The previous prime is 3121212389. The next prime is 3121212499. The reversal of 3121212481 is 1842121213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2705664256 + 415548225 = 52016^2 + 20385^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121212481 - 2⁹ = 3121211969 is a prime.

It is a super-2 number, since 2×3121212481² = 19483934703100350722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3121212581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560606240 + 1560606241.

It is an arithmetic number, because the mean of its divisors is an integer number (1560606241).

Almost surely, 2^3121212481 is an apocalyptic number.

It is an amenable number.

3121212481 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121212481 is an equidigital number, since it uses as much as digits as its factorization.

3121212481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 25.

The square root of 3121212481 is about 55867.8125668081. The cubic root of 3121212481 is about 1461.4179757739.

Adding to 3121212481 its reverse (1842121213), we get a palindrome (4963333694).

The spelling of 3121212481 in words is "three billion, one hundred twenty-one million, two hundred twelve thousand, four hundred eighty-one".