698021 has 2 divisors, whose sum is σ = 698022. Its totient is φ = 698020.

The previous prime is 698017. The next prime is 698039. The reversal of 698021 is 120896.

698021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 616225 + 81796 = 785^2 + 286^2 .

It is a cyclic number.

It is not a de Polignac number, because 698021 - 2² = 698017 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 (698051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349010 + 349011.

It is an arithmetic number, because the mean of its divisors is an integer number (349011).

2⁶⁹⁸⁰²¹ is an apocalyptic number.

It is an amenable number.

698021 is a deficient number, since it is larger than the sum of its proper divisors (1).

698021 is an equidigital number, since it uses as much as digits as its factorization.

698021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 698021 is about 835.4765107410. The cubic root of 698021 is about 88.7066468152.

The spelling of 698021 in words is "six hundred ninety-eight thousand, twenty-one".