1689471913 has 2 divisors, whose sum is σ = 1689471914. Its totient is φ = 1689471912.

The previous prime is 1689471893. The next prime is 1689471929. The reversal of 1689471913 is 3191749861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1008888169 + 680583744 = 31763^2 + 26088^2 .

It is an emirp because it is prime and its reverse (3191749861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1689471913 - 2⁵ = 1689471881 is a prime.

It is not a weakly prime, because it can be changed into another prime (1689471943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844735956 + 844735957.

It is an arithmetic number, because the mean of its divisors is an integer number (844735957).

Almost surely, 2^1689471913 is an apocalyptic number.

It is an amenable number.

1689471913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689471913 is an equidigital number, since it uses as much as digits as its factorization.

1689471913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 49.

The square root of 1689471913 is about 41103.1861660383. The cubic root of 1689471913 is about 1191.0143442797.

The spelling of 1689471913 in words is "one billion, six hundred eighty-nine million, four hundred seventy-one thousand, nine hundred thirteen".