131661222 has 128 divisors (see below), whose sum is σ = 353341440. Its totient is φ = 31674240.

The previous prime is 131661221. The next prime is 131661239. The reversal of 131661222 is 222166131.

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 = 131661192 and 131661201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131661221) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 465093 + ... + 465375.

It is an arithmetic number, because the mean of its divisors is an integer number (2760480).

Almost surely, 2^131661222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131661222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176670720).

131661222 is an abundant number, since it is smaller than the sum of its proper divisors (221680218).

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

131661222 is a wasteful number, since it uses less digits than its factorization.

131661222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378.

The product of its digits is 864, while the sum is 24.

The square root of 131661222 is about 11474.3724011381. The cubic root of 131661222 is about 508.7283736961.

The spelling of 131661222 in words is "one hundred thirty-one million, six hundred sixty-one thousand, two hundred twenty-two".