1689669321 has 16 divisors (see below), whose sum is σ = 2388254400. Its totient is φ = 1058923008.

The previous prime is 1689669283. The next prime is 1689669323. The reversal of 1689669321 is 1239669861.

It is not a de Polignac number, because 1689669321 - 2⁶ = 1689669257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1689669323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24525 + ... + 63093.

It is an arithmetic number, because the mean of its divisors is an integer number (149265900).

Almost surely, 2^1689669321 is an apocalyptic number.

It is an amenable number.

1689669321 is a deficient number, since it is larger than the sum of its proper divisors (698585079).

1689669321 is a wasteful number, since it uses less digits than its factorization.

1689669321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39448.

The product of its digits is 839808, while the sum is 51.

The square root of 1689669321 is about 41105.5874669126. The cubic root of 1689669321 is about 1191.0607308855.

The spelling of 1689669321 in words is "one billion, six hundred eighty-nine million, six hundred sixty-nine thousand, three hundred twenty-one".