689647541 has 12 divisors (see below), whose sum is σ = 794028384. Its totient is φ = 593951400.

The previous prime is 689647537. The next prime is 689647547. The reversal of 689647541 is 145746986.

It is not a de Polignac number, because 689647541 - 2² = 689647537 is a prime.

It is a super-2 number, since 2×689647541² = 951227461614693362, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 689647541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689647547) 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 11 ways as a sum of consecutive naturals, for example, 82865 + ... + 90806.

It is an arithmetic number, because the mean of its divisors is an integer number (66169032).

Almost surely, 2^689647541 is an apocalyptic number.

It is an amenable number.

689647541 is a deficient number, since it is larger than the sum of its proper divisors (104380843).

689647541 is a wasteful number, since it uses less digits than its factorization.

689647541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173720 (or 173701 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 50.

The square root of 689647541 is about 26261.1412737527. The cubic root of 689647541 is about 883.5051065339.

The spelling of 689647541 in words is "six hundred eighty-nine million, six hundred forty-seven thousand, five hundred forty-one".