698128331 has 2 divisors, whose sum is σ = 698128332. Its totient is φ = 698128330.

The previous prime is 698128283. The next prime is 698128367. The reversal of 698128331 is 133821896.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 698128331 - 2¹⁰ = 698127307 is a prime.

It is a super-2 number, since 2×698128331² = 974766333089691122, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (698128391) 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, 349064165 + 349064166.

It is an arithmetic number, because the mean of its divisors is an integer number (349064166).

Almost surely, 2^698128331 is an apocalyptic number.

698128331 is a deficient number, since it is larger than the sum of its proper divisors (1).

698128331 is an equidigital number, since it uses as much as digits as its factorization.

698128331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 41.

The square root of 698128331 is about 26422.1182156162. The cubic root of 698128331 is about 887.1119323289. Note that the first 3 decimals are identical.

The spelling of 698128331 in words is "six hundred ninety-eight million, one hundred twenty-eight thousand, three hundred thirty-one".