1721159 has 8 divisors (see below), whose sum is σ = 1959552. Its totient is φ = 1496440.

The previous prime is 1721149. The next prime is 1721183. The reversal of 1721159 is 9511271.

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

It is not a de Polignac number, because 1721159 - 2⁴ = 1721143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721149) 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, 3149 + ... + 3654.

It is an arithmetic number, because the mean of its divisors is an integer number (244944).

2^1721159 is an apocalyptic number.

1721159 is a deficient number, since it is larger than the sum of its proper divisors (238393).

1721159 is a wasteful number, since it uses less digits than its factorization.

1721159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6837.

The product of its digits is 630, while the sum is 26.

The square root of 1721159 is about 1311.9294950568. The cubic root of 1721159 is about 119.8414340846.

It can be divided in two parts, 172 and 1159, that added together give a palindrome (1331).

The spelling of 1721159 in words is "one million, seven hundred twenty-one thousand, one hundred fifty-nine".