1689777161 has 4 divisors (see below), whose sum is σ = 1735446852. Its totient is φ = 1644107472.

The previous prime is 1689777119. The next prime is 1689777181. The reversal of 1689777161 is 1617779861.

It is a happy number.

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 1560250000 + 129527161 = 39500^2 + 11381^2 .

It is a cyclic number.

It is not a de Polignac number, because 1689777161 - 2²⁶ = 1622668297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1689777181) 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, 22834790 + ... + 22834863.

It is an arithmetic number, because the mean of its divisors is an integer number (433861713).

Almost surely, 2^1689777161 is an apocalyptic number.

It is an amenable number.

1689777161 is a deficient number, since it is larger than the sum of its proper divisors (45669691).

1689777161 is an equidigital number, since it uses as much as digits as its factorization.

1689777161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45669690.

The product of its digits is 889056, while the sum is 53.

The square root of 1689777161 is about 41106.8991897954. The cubic root of 1689777161 is about 1191.0860694247.

The spelling of 1689777161 in words is "one billion, six hundred eighty-nine million, seven hundred seventy-seven thousand, one hundred sixty-one".