698111881 has 2 divisors, whose sum is σ = 698111882. Its totient is φ = 698111880.

The previous prime is 698111849. The next prime is 698111891. The reversal of 698111881 is 188111896.

It is a happy number.

698111881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 698016400 + 95481 = 26420^2 + 309^2 .

It is a cyclic number.

It is not a de Polignac number, because 698111881 - 2⁵ = 698111849 is a prime.

It is a super-2 number, since 2×698111881² = 974720396786716322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (698111891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349055940 + 349055941.

It is an arithmetic number, because the mean of its divisors is an integer number (349055941).

Almost surely, 2^698111881 is an apocalyptic number.

It is an amenable number.

698111881 is a deficient number, since it is larger than the sum of its proper divisors (1).

698111881 is an equidigital number, since it uses as much as digits as its factorization.

698111881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 43.

The square root of 698111881 is about 26421.8069215563. The cubic root of 698111881 is about 887.1049646004.

The spelling of 698111881 in words is "six hundred ninety-eight million, one hundred eleven thousand, eight hundred eighty-one".