698879999 has 2 divisors, whose sum is σ = 698880000. Its totient is φ = 698879998.

The previous prime is 698879971. The next prime is 698880031. The reversal of 698879999 is 999978896.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 698879999 - 2⁸ = 698879743 is a prime.

It is a Sophie Germain 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 (698879969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349439999 + 349440000.

It is an arithmetic number, because the mean of its divisors is an integer number (349440000).

Almost surely, 2^698879999 is an apocalyptic number.

698879999 is a deficient number, since it is larger than the sum of its proper divisors (1).

698879999 is an equidigital number, since it uses as much as digits as its factorization.

698879999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158723712, while the sum is 74.

The square root of 698879999 is about 26436.3386080599. The cubic root of 698879999 is about 887.4301997343.

The spelling of 698879999 in words is "six hundred ninety-eight million, eight hundred seventy-nine thousand, nine hundred ninety-nine".