1213313131 has 6 divisors (see below), whose sum is σ = 1239679820. Its totient is φ = 1187495796.

The previous prime is 1213313099. The next prime is 1213313147. The reversal of 1213313131 is 1313133121.

It is not a de Polignac number, because 1213313131 - 2⁵ = 1213313099 is a prime.

It is a super-2 number, since 2×1213313131² = 2944257507714046322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213313099 and 1213313108.

It is not an unprimeable number, because it can be changed into a prime (1213313161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 272421 + ... + 276838.

Almost surely, 2^1213313131 is an apocalyptic number.

1213313131 is a deficient number, since it is larger than the sum of its proper divisors (26366689).

1213313131 is an frugal number, since it uses more digits than its factorization.

1213313131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549353 (or 549306 counting only the distinct ones).

The product of its digits is 162, while the sum is 19.

The square root of 1213313131 is about 34832.6446167959. The cubic root of 1213313131 is about 1066.5739343972.

Adding to 1213313131 its reverse (1313133121), we get a palindrome (2526446252).

The spelling of 1213313131 in words is "one billion, two hundred thirteen million, three hundred thirteen thousand, one hundred thirty-one".