1768121081 has 8 divisors (see below), whose sum is σ = 1788791400. Its totient is φ = 1747468800.

The previous prime is 1768121077. The next prime is 1768121087. The reversal of 1768121081 is 1801218671.

It can be written as a sum of positive squares in 4 ways, for example, as 226773481 + 1541347600 = 15059^2 + 39260^2 .

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 1768121081 - 2² = 1768121077 is a prime.

It is a super-2 number, since 2×1768121081² = 6252504314153217122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1768121087) 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, 371525 + ... + 376253.

It is an arithmetic number, because the mean of its divisors is an integer number (223598925).

Almost surely, 2^1768121081 is an apocalyptic number.

It is an amenable number.

1768121081 is a deficient number, since it is larger than the sum of its proper divisors (20670319).

1768121081 is an equidigital number, since it uses as much as digits as its factorization.

1768121081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9019.

The product of its (nonzero) digits is 5376, while the sum is 35.

The square root of 1768121081 is about 42049.0318675710. The cubic root of 1768121081 is about 1209.2163222261.

The spelling of 1768121081 in words is "one billion, seven hundred sixty-eight million, one hundred twenty-one thousand, eighty-one".