131212533 has 4 divisors (see below), whose sum is σ = 174950048. Its totient is φ = 87475020.

The previous prime is 131212481. The next prime is 131212547. The reversal of 131212533 is 335212131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 131212533 - 2⁹ = 131212021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131212573) 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, 21868753 + ... + 21868758.

It is an arithmetic number, because the mean of its divisors is an integer number (43737512).

Almost surely, 2^131212533 is an apocalyptic number.

It is an amenable number.

131212533 is a deficient number, since it is larger than the sum of its proper divisors (43737515).

131212533 is an equidigital number, since it uses as much as digits as its factorization.

131212533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43737514.

The product of its digits is 540, while the sum is 21.

The square root of 131212533 is about 11454.8039267375. The cubic root of 131212533 is about 508.1498165706.

Adding to 131212533 its reverse (335212131), we get a palindrome (466424664).

The spelling of 131212533 in words is "one hundred thirty-one million, two hundred twelve thousand, five hundred thirty-three".