1212312131 has 8 divisors (see below), whose sum is σ = 1215953424. Its totient is φ = 1208677600.

The previous prime is 1212312113. The next prime is 1212312139. The reversal of 1212312131 is 1312132121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212312131 is a prime.

It is a super-2 number, since 2×1212312131² = 2939401405939522322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212312139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 848840 + ... + 850266.

It is an arithmetic number, because the mean of its divisors is an integer number (151994178).

Almost surely, 2^1212312131 is an apocalyptic number.

1212312131 is a deficient number, since it is larger than the sum of its proper divisors (3641293).

1212312131 is a wasteful number, since it uses less digits than its factorization.

1212312131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3381.

The product of its digits is 72, while the sum is 17.

The square root of 1212312131 is about 34818.2729468307. The cubic root of 1212312131 is about 1066.2805409822.

Adding to 1212312131 its reverse (1312132121), we get a palindrome (2524444252).

The spelling of 1212312131 in words is "one billion, two hundred twelve million, three hundred twelve thousand, one hundred thirty-one".