131215533 has 4 divisors (see below), whose sum is σ = 174954048. Its totient is φ = 87477020.

The previous prime is 131215523. The next prime is 131215573. The reversal of 131215533 is 335512131.

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 131215533 - 2¹⁰ = 131214509 is a prime.

It is a super-2 number, since 2×131215533² = 34435032200948178, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131215523) 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, 21869253 + ... + 21869258.

It is an arithmetic number, because the mean of its divisors is an integer number (43738512).

Almost surely, 2^131215533 is an apocalyptic number.

It is an amenable number.

131215533 is a deficient number, since it is larger than the sum of its proper divisors (43738515).

131215533 is an equidigital number, since it uses as much as digits as its factorization.

131215533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43738514.

The product of its digits is 1350, while the sum is 24.

The square root of 131215533 is about 11454.9348754150. The cubic root of 131215533 is about 508.1536892643.

Adding to 131215533 its reverse (335512131), we get a palindrome (466727664).

The spelling of 131215533 in words is "one hundred thirty-one million, two hundred fifteen thousand, five hundred thirty-three".