1698744401 has 2 divisors, whose sum is σ = 1698744402. Its totient is φ = 1698744400.

The previous prime is 1698744389. The next prime is 1698744403. The reversal of 1698744401 is 1044478961.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 947162176 + 751582225 = 30776^2 + 27415^2 .

It is an emirp because it is prime and its reverse (1044478961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1698744401 - 2⁶ = 1698744337 is a prime.

Together with 1698744403, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1698744403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 849372200 + 849372201.

It is an arithmetic number, because the mean of its divisors is an integer number (849372201).

Almost surely, 2^1698744401 is an apocalyptic number.

It is an amenable number.

1698744401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1698744401 is an equidigital number, since it uses as much as digits as its factorization.

1698744401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 1698744401 is about 41215.8270692218. The cubic root of 1698744401 is about 1193.1892889102.

The spelling of 1698744401 in words is "one billion, six hundred ninety-eight million, seven hundred forty-four thousand, four hundred one".