1689621073 has 4 divisors (see below), whose sum is σ = 1930995520. Its totient is φ = 1448246628.

The previous prime is 1689621071. The next prime is 1689621077. The reversal of 1689621073 is 3701269861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1689621073 - 2¹ = 1689621071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1689621071) 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, 120687213 + ... + 120687226.

It is an arithmetic number, because the mean of its divisors is an integer number (482748880).

Almost surely, 2^1689621073 is an apocalyptic number.

It is an amenable number.

1689621073 is a deficient number, since it is larger than the sum of its proper divisors (241374447).

1689621073 is an equidigital number, since it uses as much as digits as its factorization.

1689621073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241374446.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 1689621073 is about 41105.0005838706. Note that the first 3 decimals coincide. The cubic root of 1689621073 is about 1191.0493939838.

The spelling of 1689621073 in words is "one billion, six hundred eighty-nine million, six hundred twenty-one thousand, seventy-three".