698855081 has 4 divisors (see below), whose sum is σ = 698908164. Its totient is φ = 698802000.

The previous prime is 698855077. The next prime is 698855083. The reversal of 698855081 is 180558896.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 648160681 + 50694400 = 25459^2 + 7120^2 .

It is a cyclic number.

It is not a de Polignac number, because 698855081 - 2² = 698855077 is a prime.

It is a super-2 number, since 2×698855081² = 976796848479033122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (698855083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9731 + ... + 38631.

It is an arithmetic number, because the mean of its divisors is an integer number (174727041).

Almost surely, 2^698855081 is an apocalyptic number.

It is an amenable number.

698855081 is a deficient number, since it is larger than the sum of its proper divisors (53083).

698855081 is a wasteful number, since it uses less digits than its factorization.

698855081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53082.

The product of its (nonzero) digits is 691200, while the sum is 50.

The square root of 698855081 is about 26435.8673207444. The cubic root of 698855081 is about 887.4196527408.

The spelling of 698855081 in words is "six hundred ninety-eight million, eight hundred fifty-five thousand, eighty-one".