1721161169 has 16 divisors (see below), whose sum is σ = 2123038848. Its totient is φ = 1358785152.

The previous prime is 1721161163. The next prime is 1721161193. The reversal of 1721161169 is 9611611271.

It is a cyclic number.

It is not a de Polignac number, because 1721161169 - 2¹⁶ = 1721095633 is a prime.

It is a super-2 number, since 2×1721161169² = 5924791539346893122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1721161163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20894 + ... + 62280.

It is an arithmetic number, because the mean of its divisors is an integer number (132689928).

Almost surely, 2^1721161169 is an apocalyptic number.

It is an amenable number.

1721161169 is a deficient number, since it is larger than the sum of its proper divisors (401877679).

1721161169 is a wasteful number, since it uses less digits than its factorization.

1721161169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41864.

The product of its digits is 4536, while the sum is 35.

The square root of 1721161169 is about 41486.8794801441. The cubic root of 1721161169 is about 1198.4148442582.

The spelling of 1721161169 in words is "one billion, seven hundred twenty-one million, one hundred sixty-one thousand, one hundred sixty-nine".