689312545 has 4 divisors (see below), whose sum is σ = 827175060. Its totient is φ = 551450032.

The previous prime is 689312527. The next prime is 689312557. The reversal of 689312545 is 545213986.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 545213986 = 2 ⋅272606993.

It can be written as a sum of positive squares in 2 ways, for example, as 521117584 + 168194961 = 22828^2 + 12969^2 .

It is a cyclic number.

It is not a de Polignac number, because 689312545 - 2⁷ = 689312417 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68931250 + ... + 68931259.

It is an arithmetic number, because the mean of its divisors is an integer number (206793765).

Almost surely, 2^689312545 is an apocalyptic number.

It is an amenable number.

689312545 is a deficient number, since it is larger than the sum of its proper divisors (137862515).

689312545 is a wasteful number, since it uses less digits than its factorization.

689312545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137862514.

The product of its digits is 259200, while the sum is 43.

The square root of 689312545 is about 26254.7623299088. The cubic root of 689312545 is about 883.3620292881.

The spelling of 689312545 in words is "six hundred eighty-nine million, three hundred twelve thousand, five hundred forty-five".