698315909 has 2 divisors, whose sum is σ = 698315910. Its totient is φ = 698315908.

The previous prime is 698315887. The next prime is 698315921. The reversal of 698315909 is 909513896.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 464531809 + 233784100 = 21553^2 + 15290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-698315909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (698315929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349157954 + 349157955.

It is an arithmetic number, because the mean of its divisors is an integer number (349157955).

Almost surely, 2^698315909 is an apocalyptic number.

It is an amenable number.

698315909 is a deficient number, since it is larger than the sum of its proper divisors (1).

698315909 is an equidigital number, since it uses as much as digits as its factorization.

698315909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 524880, while the sum is 50.

The square root of 698315909 is about 26425.6676169212. The cubic root of 698315909 is about 887.1913770257.

The spelling of 698315909 in words is "six hundred ninety-eight million, three hundred fifteen thousand, nine hundred nine".