698121971 has 2 divisors, whose sum is σ = 698121972. Its totient is φ = 698121970.

The previous prime is 698121961. The next prime is 698122027. The reversal of 698121971 is 179121896.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 698121971 - 2¹⁰ = 698120947 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (698121961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349060985 + 349060986.

It is an arithmetic number, because the mean of its divisors is an integer number (349060986).

Almost surely, 2^698121971 is an apocalyptic number.

698121971 is a deficient number, since it is larger than the sum of its proper divisors (1).

698121971 is an equidigital number, since it uses as much as digits as its factorization.

698121971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 44.

The square root of 698121971 is about 26421.9978616304. The cubic root of 698121971 is about 887.1092384359.

The spelling of 698121971 in words is "six hundred ninety-eight million, one hundred twenty-one thousand, nine hundred seventy-one".