698994521 has 2 divisors, whose sum is σ = 698994522. Its totient is φ = 698994520.

The previous prime is 698994493. The next prime is 698994529. The reversal of 698994521 is 125499896.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 698016400 + 978121 = 26420^2 + 989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-698994521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (698994529) 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 as a sum of consecutive naturals, namely, 349497260 + 349497261.

It is an arithmetic number, because the mean of its divisors is an integer number (349497261).

Almost surely, 2^698994521 is an apocalyptic number.

It is an amenable number.

698994521 is a deficient number, since it is larger than the sum of its proper divisors (1).

698994521 is an equidigital number, since it uses as much as digits as its factorization.

698994521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 53.

The square root of 698994521 is about 26438.5045151953. The cubic root of 698994521 is about 887.4786700157.

The spelling of 698994521 in words is "six hundred ninety-eight million, nine hundred ninety-four thousand, five hundred twenty-one".