1722291394321 has 9 divisors (see below), whose sum is σ = 1731607854249. Its totient is φ = 1713024813300.

The previous prime is 1722291394309. The next prime is 1722291394337. The reversal of 1722291394321 is 1234931922271.

The square root of 1722291394321 is 1312361.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1722291394321 - 2²³ = 1722283005713 is a prime.

It is a super-2 number, since 2×1722291394321² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1722291394301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 250657516 + ... + 250664386.

Almost surely, 2^{1722291394321} is an apocalyptic number.

1722291394321 is the 1312361-st square number.

1722291394321 is the 656181-st centered octagonal number.

It is an amenable number.

1722291394321 is a deficient number, since it is larger than the sum of its proper divisors (9316459928).

1722291394321 is an frugal number, since it uses more digits than its factorization.

1722291394321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14124 (or 7062 counting only the distinct ones).

The product of its digits is 326592, while the sum is 46.

The spelling of 1722291394321 in words is "one trillion, seven hundred twenty-two billion, two hundred ninety-one million, three hundred ninety-four thousand, three hundred twenty-one".