1721522 has 16 divisors (see below), whose sum is σ = 2983392. Its totient is φ = 736320.

The previous prime is 1721521. The next prime is 1721543. The reversal of 1721522 is 2251271.

It is a junction number, because it is equal to n+sod(n) for n = 1721494 and 1721503.

It is not an unprimeable number, because it can be changed into a prime (1721521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1928 + ... + 2675.

It is an arithmetic number, because the mean of its divisors is an integer number (186462).

2^1721522 is an apocalyptic number.

1721522 is a deficient number, since it is larger than the sum of its proper divisors (1261870).

1721522 is a wasteful number, since it uses less digits than its factorization.

1721522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4633.

The product of its digits is 280, while the sum is 20.

The square root of 1721522 is about 1312.0678336123. The cubic root of 1721522 is about 119.8498585208.

Adding to 1721522 its reverse (2251271), we get a palindrome (3972793).

The spelling of 1721522 in words is "one million, seven hundred twenty-one thousand, five hundred twenty-two".