698226409 has 2 divisors, whose sum is σ = 698226410. Its totient is φ = 698226408.

The previous prime is 698226401. The next prime is 698226437. The reversal of 698226409 is 904622896.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 626400784 + 71825625 = 25028^2 + 8475^2 .

It is a cyclic number.

It is not a de Polignac number, because 698226409 - 2³ = 698226401 is a prime.

It is not a weakly prime, because it can be changed into another prime (698226401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349113204 + 349113205.

It is an arithmetic number, because the mean of its divisors is an integer number (349113205).

Almost surely, 2^698226409 is an apocalyptic number.

It is an amenable number.

698226409 is a deficient number, since it is larger than the sum of its proper divisors (1).

698226409 is an equidigital number, since it uses as much as digits as its factorization.

698226409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 698226409 is about 26423.9741333509. The cubic root of 698226409 is about 887.1534729674.

The spelling of 698226409 in words is "six hundred ninety-eight million, two hundred twenty-six thousand, four hundred nine".