2131722 has 12 divisors (see below), whose sum is σ = 4618770. Its totient is φ = 710568.

The previous prime is 2131721. The next prime is 2131771. The reversal of 2131722 is 2271312.

It can be written as a sum of positive squares in only one way, i.e., 1962801 + 168921 = 1401^2 + 411^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 118429 = 2131722 / (2 + 1 + 3 + 1 + 7 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 2131695 and 2131704.

It is not an unprimeable number, because it can be changed into a prime (2131721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 59197 + ... + 59232.

2^2131722 is an apocalyptic number.

2131722 is an abundant number, since it is smaller than the sum of its proper divisors (2487048).

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

2131722 is a wasteful number, since it uses less digits than its factorization.

2131722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118437 (or 118434 counting only the distinct ones).

The product of its digits is 168, while the sum is 18.

The square root of 2131722 is about 1460.0417802241. The cubic root of 2131722 is about 128.6994988416.

The spelling of 2131722 in words is "two million, one hundred thirty-one thousand, seven hundred twenty-two".