1091722 has 8 divisors (see below), whose sum is σ = 1681956. Its totient is φ = 531072.

The previous prime is 1091711. The next prime is 1091729. The reversal of 1091722 is 2271901.

It can be written as a sum of positive squares in 2 ways, for example, as 1038361 + 53361 = 1019^2 + 231^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1091693 and 1091702.

It is not an unprimeable number, because it can be changed into a prime (1091729) 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 3 ways as a sum of consecutive naturals, for example, 7303 + ... + 7450.

2^1091722 is an apocalyptic number.

1091722 is a deficient number, since it is larger than the sum of its proper divisors (590234).

1091722 is a wasteful number, since it uses less digits than its factorization.

1091722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14792.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 1091722 is about 1044.8550138656. The cubic root of 1091722 is about 102.9684133515.

The spelling of 1091722 in words is "one million, ninety-one thousand, seven hundred twenty-two".