698536109 has 2 divisors, whose sum is σ = 698536110. Its totient is φ = 698536108.

The previous prime is 698536093. The next prime is 698536129. The reversal of 698536109 is 901635896.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 540330025 + 158206084 = 23245^2 + 12578^2 .

It is a cyclic number.

It is not a de Polignac number, because 698536109 - 2⁴ = 698536093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (698536129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349268054 + 349268055.

It is an arithmetic number, because the mean of its divisors is an integer number (349268055).

Almost surely, 2^698536109 is an apocalyptic number.

It is an amenable number.

698536109 is a deficient number, since it is larger than the sum of its proper divisors (1).

698536109 is an equidigital number, since it uses as much as digits as its factorization.

698536109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 698536109 is about 26429.8336922501. The cubic root of 698536109 is about 887.2846199301.

The spelling of 698536109 in words is "six hundred ninety-eight million, five hundred thirty-six thousand, one hundred nine".