131533256813 has 4 divisors (see below), whose sum is σ = 150323722080. Its totient is φ = 112742791548.

The previous prime is 131533256693. The next prime is 131533256837. The reversal of 131533256813 is 318652335131.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 131533256813 - 2¹² = 131533252717 is a prime.

It is a super-2 number, since 2×131533256813² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131533256873) 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, 9395232623 + ... + 9395232636.

It is an arithmetic number, because the mean of its divisors is an integer number (37580930520).

Almost surely, 2^131533256813 is an apocalyptic number.

It is an amenable number.

131533256813 is a deficient number, since it is larger than the sum of its proper divisors (18790465267).

131533256813 is an equidigital number, since it uses as much as digits as its factorization.

131533256813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18790465266.

The product of its digits is 194400, while the sum is 41.

The spelling of 131533256813 in words is "one hundred thirty-one billion, five hundred thirty-three million, two hundred fifty-six thousand, eight hundred thirteen".