698551 has 4 divisors (see below), whose sum is σ = 798352. Its totient is φ = 598752.

The previous prime is 698543. The next prime is 698557. The reversal of 698551 is 155896.

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

It is not a de Polignac number, because 698551 - 2³ = 698543 is a prime.

It is a Duffinian number.

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (698557) by changing a digit.

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, 49890 + ... + 49903.

It is an arithmetic number, because the mean of its divisors is an integer number (199588).

2⁶⁹⁸⁵⁵¹ is an apocalyptic number.

698551 is a deficient number, since it is larger than the sum of its proper divisors (99801).

698551 is an equidigital number, since it uses as much as digits as its factorization.

698551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99800.

The product of its digits is 10800, while the sum is 34.

The square root of 698551 is about 835.7936348166. The cubic root of 698551 is about 88.7290924763.

The spelling of 698551 in words is "six hundred ninety-eight thousand, five hundred fifty-one".