1212912131 has 4 divisors (see below), whose sum is σ = 1224921264. Its totient is φ = 1200903000.

The previous prime is 1212912109. The next prime is 1212912161. The reversal of 1212912131 is 1312192121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212912131 is a prime.

It is a super-2 number, since 2×1212912131² = 2942311675053922322, 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 = 1212912097 and 1212912106.

It is not an unprimeable number, because it can be changed into a prime (1212912161) 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 3 ways as a sum of consecutive naturals, for example, 6004415 + ... + 6004616.

It is an arithmetic number, because the mean of its divisors is an integer number (306230316).

Almost surely, 2^1212912131 is an apocalyptic number.

1212912131 is a deficient number, since it is larger than the sum of its proper divisors (12009133).

1212912131 is a wasteful number, since it uses less digits than its factorization.

1212912131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12009132.

The product of its digits is 216, while the sum is 23.

The square root of 1212912131 is about 34826.8880464505. Note that the first 3 decimals coincide. The cubic root of 1212912131 is about 1066.4564205520.

The spelling of 1212912131 in words is "one billion, two hundred twelve million, nine hundred twelve thousand, one hundred thirty-one".