131222213 has 4 divisors (see below), whose sum is σ = 131417868. Its totient is φ = 131026560.

The previous prime is 131222209. The next prime is 131222237. The reversal of 131222213 is 312222131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31561924 + 99660289 = 5618^2 + 9983^2 .

It is a cyclic number.

It is not a de Polignac number, because 131222213 - 2² = 131222209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131222191 and 131222200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131222243) 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, 96818 + ... + 98163.

It is an arithmetic number, because the mean of its divisors is an integer number (32854467).

Almost surely, 2^131222213 is an apocalyptic number.

It is an amenable number.

131222213 is a deficient number, since it is larger than the sum of its proper divisors (195655).

131222213 is an equidigital number, since it uses as much as digits as its factorization.

131222213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195654.

The product of its digits is 144, while the sum is 17.

The square root of 131222213 is about 11455.2264490930. The cubic root of 131222213 is about 508.1623122501.

Adding to 131222213 its reverse (312222131), we get a palindrome (443444344).

The spelling of 131222213 in words is "one hundred thirty-one million, two hundred twenty-two thousand, two hundred thirteen".