690559 has 4 divisors (see below), whose sum is σ = 693504. Its totient is φ = 687616.

The previous prime is 690553. The next prime is 690583. The reversal of 690559 is 955096.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 690559 - 2¹¹ = 688511 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 (690553) 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, 1087 + ... + 1600.

It is an arithmetic number, because the mean of its divisors is an integer number (173376).

2⁶⁹⁰⁵⁵⁹ is an apocalyptic number.

690559 is a deficient number, since it is larger than the sum of its proper divisors (2945).

690559 is a wasteful number, since it uses less digits than its factorization.

690559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2944.

The product of its (nonzero) digits is 12150, while the sum is 34.

The square root of 690559 is about 830.9987966297. The cubic root of 690559 is about 88.3894157526.

The spelling of 690559 in words is "six hundred ninety thousand, five hundred fifty-nine".