1718872121 has 8 divisors (see below), whose sum is σ = 1744687560. Its totient is φ = 1693239552.

The previous prime is 1718872117. The next prime is 1718872123. The reversal of 1718872121 is 1212788171.

It can be written as a sum of positive squares in 4 ways, for example, as 308494096 + 1410378025 = 17564^2 + 37555^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1718872121 - 2² = 1718872117 is a prime.

It is a super-3 number, since 3×1718872121³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1718872123) 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 7 ways as a sum of consecutive naturals, for example, 26720 + ... + 64433.

It is an arithmetic number, because the mean of its divisors is an integer number (218085945).

Almost surely, 2^1718872121 is an apocalyptic number.

It is an amenable number.

1718872121 is a deficient number, since it is larger than the sum of its proper divisors (25815439).

1718872121 is a wasteful number, since it uses less digits than its factorization.

1718872121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91435.

The product of its digits is 12544, while the sum is 38.

The square root of 1718872121 is about 41459.2826879578. The cubic root of 1718872121 is about 1197.8833336779.

The spelling of 1718872121 in words is "one billion, seven hundred eighteen million, eight hundred seventy-two thousand, one hundred twenty-one".