1689525545 has 4 divisors (see below), whose sum is σ = 2027430660. Its totient is φ = 1351620432.

The previous prime is 1689525527. The next prime is 1689525641. The reversal of 1689525545 is 5455259861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5455259861 = 29 ⋅188112409.

It can be written as a sum of positive squares in 2 ways, for example, as 797667049 + 891858496 = 28243^2 + 29864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1689525545 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1689525493 and 1689525502.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168952550 + ... + 168952559.

It is an arithmetic number, because the mean of its divisors is an integer number (506857665).

Almost surely, 2^1689525545 is an apocalyptic number.

It is an amenable number.

1689525545 is a deficient number, since it is larger than the sum of its proper divisors (337905115).

1689525545 is an equidigital number, since it uses as much as digits as its factorization.

1689525545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337905114.

The product of its digits is 2160000, while the sum is 50.

The square root of 1689525545 is about 41103.8385677056. The cubic root of 1689525545 is about 1191.0269469960.

The spelling of 1689525545 in words is "one billion, six hundred eighty-nine million, five hundred twenty-five thousand, five hundred forty-five".