131212133 has 4 divisors (see below), whose sum is σ = 141305388. Its totient is φ = 121118880.

The previous prime is 131212111. The next prime is 131212183. The reversal of 131212133 is 331212131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 331212131 = 6143 ⋅53917.

It can be written as a sum of positive squares in 2 ways, for example, as 59013124 + 72199009 = 7682^2 + 8497^2 .

It is a cyclic number.

It is not a de Polignac number, because 131212133 - 2¹⁶ = 131146597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131212183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5046608 + ... + 5046633.

It is an arithmetic number, because the mean of its divisors is an integer number (35326347).

Almost surely, 2^131212133 is an apocalyptic number.

131212133 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

131212133 is a deficient number, since it is larger than the sum of its proper divisors (10093255).

131212133 is a wasteful number, since it uses less digits than its factorization.

131212133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10093254.

The product of its digits is 108, while the sum is 17.

The square root of 131212133 is about 11454.7864668007. The cubic root of 131212133 is about 508.1493002070.

Adding to 131212133 its reverse (331212131), we get a palindrome (462424264).

The spelling of 131212133 in words is "one hundred thirty-one million, two hundred twelve thousand, one hundred thirty-three".