1698897961 has 2 divisors, whose sum is σ = 1698897962. Its totient is φ = 1698897960.

The previous prime is 1698897919. The next prime is 1698897971. The reversal of 1698897961 is 1697988961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1409251600 + 289646361 = 37540^2 + 17019^2 .

It is a cyclic number.

It is not a de Polignac number, because 1698897961 - 2⁷ = 1698897833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1698897893 and 1698897902.

It is not a weakly prime, because it can be changed into another prime (1698897911) 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, 849448980 + 849448981.

It is an arithmetic number, because the mean of its divisors is an integer number (849448981).

Almost surely, 2^1698897961 is an apocalyptic number.

It is an amenable number.

1698897961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1698897961 is an equidigital number, since it uses as much as digits as its factorization.

1698897961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11757312, while the sum is 64.

The square root of 1698897961 is about 41217.6899037294. The cubic root of 1698897961 is about 1193.2252410771.

The spelling of 1698897961 in words is "one billion, six hundred ninety-eight million, eight hundred ninety-seven thousand, nine hundred sixty-one".