131231322 has 36 divisors (see below), whose sum is σ = 294511230. Its totient is φ = 42230496.

The previous prime is 131231299. The next prime is 131231323. The reversal of 131231322 is 223132131.

131231322 is a `hidden beast` number, since 1 + 312 + 31 + 322 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 111703761 + 19527561 = 10569^2 + 4419^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 131231295 and 131231304.

It is not an unprimeable number, because it can be changed into a prime (131231323) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10804 + ... + 19472.

Almost surely, 2^131231322 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131231322, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147255615).

131231322 is an abundant number, since it is smaller than the sum of its proper divisors (163279908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131231322 is a wasteful number, since it uses less digits than its factorization.

131231322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8735 (or 8703 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 131231322 is about 11455.6240336352. The cubic root of 131231322 is about 508.1740702782.

Adding to 131231322 its reverse (223132131), we get a palindrome (354363453).

The spelling of 131231322 in words is "one hundred thirty-one million, two hundred thirty-one thousand, three hundred twenty-two".