1689261121 has 4 divisors (see below), whose sum is σ = 1689612372. Its totient is φ = 1688909872.

The previous prime is 1689261097. The next prime is 1689261143. The reversal of 1689261121 is 1211629861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 540051121 + 1149210000 = 23239^2 + 33900^2 .

It is a cyclic number.

It is not a de Polignac number, because 1689261121 - 2¹⁷ = 1689130049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1689261191) 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, 168310 + ... + 178063.

It is an arithmetic number, because the mean of its divisors is an integer number (422403093).

Almost surely, 2^1689261121 is an apocalyptic number.

It is an amenable number.

1689261121 is a deficient number, since it is larger than the sum of its proper divisors (351251).

1689261121 is an equidigital number, since it uses as much as digits as its factorization.

1689261121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351250.

The product of its digits is 10368, while the sum is 37.

The square root of 1689261121 is about 41100.6219052705. The cubic root of 1689261121 is about 1190.9648087344.

The spelling of 1689261121 in words is "one billion, six hundred eighty-nine million, two hundred sixty-one thousand, one hundred twenty-one".