1212323131 has 8 divisors (see below), whose sum is σ = 1220624720. Its totient is φ = 1204042752.

The previous prime is 1212323129. The next prime is 1212323141. The reversal of 1212323131 is 1313232121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1212323131 - 2¹ = 1212323129 is a prime.

It is a super-2 number, since 2×1212323131² = 2939454747915286322, 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 = 1212323099 and 1212323108.

It is not an unprimeable number, because it can be changed into a prime (1212323141) 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 7 ways as a sum of consecutive naturals, for example, 119215 + ... + 128983.

It is an arithmetic number, because the mean of its divisors is an integer number (152578090).

Almost surely, 2^1212323131 is an apocalyptic number.

1212323131 is a deficient number, since it is larger than the sum of its proper divisors (8301589).

1212323131 is an equidigital number, since it uses as much as digits as its factorization.

1212323131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10605.

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

The square root of 1212323131 is about 34818.4309095054. The cubic root of 1212323131 is about 1066.2837659631.

Adding to 1212323131 its reverse (1313232121), we get a palindrome (2525555252).

The spelling of 1212323131 in words is "one billion, two hundred twelve million, three hundred twenty-three thousand, one hundred thirty-one".