689555497 has 4 divisors (see below), whose sum is σ = 693020800. Its totient is φ = 686090196.

The previous prime is 689555459. The next prime is 689555521. The reversal of 689555497 is 794555986.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 689555497 - 2¹⁹ = 689031209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689555197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1732353 + ... + 1732750.

It is an arithmetic number, because the mean of its divisors is an integer number (173255200).

Almost surely, 2^689555497 is an apocalyptic number.

It is an amenable number.

689555497 is a deficient number, since it is larger than the sum of its proper divisors (3465303).

689555497 is a wasteful number, since it uses less digits than its factorization.

689555497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3465302.

The product of its digits is 13608000, while the sum is 58.

The square root of 689555497 is about 26259.3887400297. The cubic root of 689555497 is about 883.4657990339.

The spelling of 689555497 in words is "six hundred eighty-nine million, five hundred fifty-five thousand, four hundred ninety-seven".