1720542223 has 4 divisors (see below), whose sum is σ = 1720634080. Its totient is φ = 1720450368.

The previous prime is 1720542221. The next prime is 1720542227. The reversal of 1720542223 is 3222450271.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3222450271 = 4357 ⋅739603.

It is a cyclic number.

It is not a de Polignac number, because 1720542223 - 2¹ = 1720542221 is a prime.

It is a super-2 number, since 2×1720542223² = 5920531082251563458, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1720542191 and 1720542200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720542221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6615 + ... + 59032.

It is an arithmetic number, because the mean of its divisors is an integer number (430158520).

Almost surely, 2^1720542223 is an apocalyptic number.

1720542223 is a deficient number, since it is larger than the sum of its proper divisors (91857).

1720542223 is an equidigital number, since it uses as much as digits as its factorization.

1720542223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91856.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 1720542223 is about 41479.4192702839. The cubic root of 1720542223 is about 1198.2711732259.

Adding to 1720542223 its reverse (3222450271), we get a palindrome (4942992494).

The spelling of 1720542223 in words is "one billion, seven hundred twenty million, five hundred forty-two thousand, two hundred twenty-three".