698549 has 4 divisors (see below), whose sum is σ = 700236. Its totient is φ = 696864.

The previous prime is 698543. The next prime is 698557. The reversal of 698549 is 945896.

698549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 532900 + 165649 = 730^2 + 407^2 .

It is a cyclic number.

It is not a de Polignac number, because 698549 - 2⁸ = 698293 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (698543) 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, 257 + ... + 1209.

It is an arithmetic number, because the mean of its divisors is an integer number (175059).

2⁶⁹⁸⁵⁴⁹ is an apocalyptic number.

It is an amenable number.

698549 is a deficient number, since it is larger than the sum of its proper divisors (1687).

698549 is an equidigital number, since it uses as much as digits as its factorization.

698549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686.

The product of its digits is 77760, while the sum is 41.

The square root of 698549 is about 835.7924383482. The cubic root of 698549 is about 88.7290077971.

The spelling of 698549 in words is "six hundred ninety-eight thousand, five hundred forty-nine".