1689228517 has 4 divisors (see below), whose sum is σ = 1689734476. Its totient is φ = 1688722560.

The previous prime is 1689228509. The next prime is 1689228529. The reversal of 1689228517 is 7158229861.

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 719902561 + 969325956 = 26831^2 + 31134^2 .

It is a cyclic number.

It is not a de Polignac number, because 1689228517 - 2³ = 1689228509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689228557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247938 + ... + 254659.

It is an arithmetic number, because the mean of its divisors is an integer number (422433619).

Almost surely, 2^1689228517 is an apocalyptic number.

It is an amenable number.

1689228517 is a deficient number, since it is larger than the sum of its proper divisors (505959).

1689228517 is an equidigital number, since it uses as much as digits as its factorization.

1689228517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505958.

The product of its digits is 483840, while the sum is 49.

The square root of 1689228517 is about 41100.2252670226. The cubic root of 1689228517 is about 1190.9571465153.

The spelling of 1689228517 in words is "one billion, six hundred eighty-nine million, two hundred twenty-eight thousand, five hundred seventeen".