131213231 has 4 divisors (see below), whose sum is σ = 131680464. Its totient is φ = 130746000.

The previous prime is 131213177. The next prime is 131213249. The reversal of 131213231 is 132312131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132312131 = 7 ⋅18901733.

It is a cyclic number.

It is not a de Polignac number, because 131213231 - 2¹⁴ = 131196847 is a prime.

It is a super-2 number, since 2×131213231² = 34433823978918722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131213261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233195 + ... + 233756.

It is an arithmetic number, because the mean of its divisors is an integer number (32920116).

Almost surely, 2^131213231 is an apocalyptic number.

131213231 is a deficient number, since it is larger than the sum of its proper divisors (467233).

131213231 is an equidigital number, since it uses as much as digits as its factorization.

131213231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467232.

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

The square root of 131213231 is about 11454.8343942634. The cubic root of 131213231 is about 508.1507176226.

Adding to 131213231 its reverse (132312131), we get a palindrome (263525362).

The spelling of 131213231 in words is "one hundred thirty-one million, two hundred thirteen thousand, two hundred thirty-one".