698387257 has 2 divisors, whose sum is σ = 698387258. Its totient is φ = 698387256.

The previous prime is 698387243. The next prime is 698387267. The reversal of 698387257 is 752783896.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 516380176 + 182007081 = 22724^2 + 13491^2 .

It is a cyclic number.

It is not a de Polignac number, because 698387257 - 2²³ = 689998649 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 698387198 and 698387207.

It is not a weakly prime, because it can be changed into another prime (698387227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349193628 + 349193629.

It is an arithmetic number, because the mean of its divisors is an integer number (349193629).

Almost surely, 2^698387257 is an apocalyptic number.

It is an amenable number.

698387257 is a deficient number, since it is larger than the sum of its proper divisors (1).

698387257 is an equidigital number, since it uses as much as digits as its factorization.

698387257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 55.

The square root of 698387257 is about 26427.0175577949. The cubic root of 698387257 is about 887.2215912281.

The spelling of 698387257 in words is "six hundred ninety-eight million, three hundred eighty-seven thousand, two hundred fifty-seven".