698906881 has 2 divisors, whose sum is σ = 698906882. Its totient is φ = 698906880.

The previous prime is 698906867. The next prime is 698906893. The reversal of 698906881 is 188609896.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 634586481 + 64320400 = 25191^2 + 8020^2 .

It is a cyclic number.

It is not a de Polignac number, because 698906881 - 2¹⁷ = 698775809 is a prime.

It is a super-2 number, since 2×698906881² = 976941656618296322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (698906081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349453440 + 349453441.

It is an arithmetic number, because the mean of its divisors is an integer number (349453441).

Almost surely, 2^698906881 is an apocalyptic number.

It is an amenable number.

698906881 is a deficient number, since it is larger than the sum of its proper divisors (1).

698906881 is an equidigital number, since it uses as much as digits as its factorization.

698906881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1492992, while the sum is 55.

The square root of 698906881 is about 26436.8470321254. The cubic root of 698906881 is about 887.4415777452.

The spelling of 698906881 in words is "six hundred ninety-eight million, nine hundred six thousand, eight hundred eighty-one".