1689891321 has 8 divisors (see below), whose sum is σ = 2253396064. Its totient is φ = 1126490400.

The previous prime is 1689891319. The next prime is 1689891361. The reversal of 1689891321 is 1231989861.

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

It is not a de Polignac number, because 1689891321 - 2¹ = 1689891319 is a prime.

It is a super-2 number, since 2×1689891321² = 5711465353582250082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1689891311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28125 + ... + 64581.

It is an arithmetic number, because the mean of its divisors is an integer number (281674508).

Almost surely, 2^1689891321 is an apocalyptic number.

It is an amenable number.

1689891321 is a deficient number, since it is larger than the sum of its proper divisors (563504743).

1689891321 is a wasteful number, since it uses less digits than its factorization.

1689891321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51911.

The product of its digits is 186624, while the sum is 48.

The square root of 1689891321 is about 41108.2877410383. The cubic root of 1689891321 is about 1191.1128917629.

The spelling of 1689891321 in words is "one billion, six hundred eighty-nine million, eight hundred ninety-one thousand, three hundred twenty-one".