3131121223 has 2 divisors, whose sum is σ = 3131121224. Its totient is φ = 3131121222.

The previous prime is 3131121221. The next prime is 3131121281. The reversal of 3131121223 is 3221211313.

3131121223 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3131121223 - 2¹ = 3131121221 is a prime.

It is a super-2 number, since 2×3131121223² = 19607840226242031458, which contains 22 as substring.

Together with 3131121221, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 3131121223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3131121221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1565560611 + 1565560612.

It is an arithmetic number, because the mean of its divisors is an integer number (1565560612).

Almost surely, 2^3131121223 is an apocalyptic number.

3131121223 is a deficient number, since it is larger than the sum of its proper divisors (1).

3131121223 is an equidigital number, since it uses as much as digits as its factorization.

3131121223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 19.

The square root of 3131121223 is about 55956.4225357554. The cubic root of 3131121223 is about 1462.9628366165.

Adding to 3131121223 its reverse (3221211313), we get a palindrome (6352332536).

The spelling of 3131121223 in words is "three billion, one hundred thirty-one million, one hundred twenty-one thousand, two hundred twenty-three".