698917649 has 2 divisors, whose sum is σ = 698917650. Its totient is φ = 698917648.

The previous prime is 698917633. The next prime is 698917673. The reversal of 698917649 is 946719896.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 675220225 + 23697424 = 25985^2 + 4868^2 .

It is a cyclic number.

It is not a de Polignac number, because 698917649 - 2⁴ = 698917633 is a prime.

It is a super-3 number, since 3×698917649³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (698919649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349458824 + 349458825.

It is an arithmetic number, because the mean of its divisors is an integer number (349458825).

Almost surely, 2^698917649 is an apocalyptic number.

It is an amenable number.

698917649 is a deficient number, since it is larger than the sum of its proper divisors (1).

698917649 is an equidigital number, since it uses as much as digits as its factorization.

698917649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 59.

The square root of 698917649 is about 26437.0506864892. The cubic root of 698917649 is about 887.4461353013.

The spelling of 698917649 in words is "six hundred ninety-eight million, nine hundred seventeen thousand, six hundred forty-nine".