698557 has 2 divisors, whose sum is σ = 698558. Its totient is φ = 698556.

The previous prime is 698543. The next prime is 698567. The reversal of 698557 is 755896.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 630436 + 68121 = 794^2 + 261^2 .

It is a cyclic number.

It is not a de Polignac number, because 698557 - 2¹⁵ = 665789 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (698507) 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 as a sum of consecutive naturals, namely, 349278 + 349279.

It is an arithmetic number, because the mean of its divisors is an integer number (349279).

2⁶⁹⁸⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

698557 is a deficient number, since it is larger than the sum of its proper divisors (1).

698557 is an equidigital number, since it uses as much as digits as its factorization.

698557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 40.

The square root of 698557 is about 835.7972242117. The cubic root of 698557 is about 88.7293465132.

The spelling of 698557 in words is "six hundred ninety-eight thousand, five hundred fifty-seven".