1898898961 has 2 divisors, whose sum is σ = 1898898962. Its totient is φ = 1898898960.

The previous prime is 1898898949. The next prime is 1898898971. The reversal of 1898898961 is 1698988981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1898780625 + 118336 = 43575^2 + 344^2 .

It is an emirp because it is prime and its reverse (1698988981) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1968688681 and 1868868691.

It is a cyclic number.

It is not a de Polignac number, because 1898898961 - 2¹¹ = 1898896913 is a prime.

It is not a weakly prime, because it can be changed into another prime (1898898971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 949449480 + 949449481.

It is an arithmetic number, because the mean of its divisors is an integer number (949449481).

Almost surely, 2^1898898961 is an apocalyptic number.

It is an amenable number.

1898898961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1898898961 is an equidigital number, since it uses as much as digits as its factorization.

1898898961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17915904, while the sum is 67.

The square root of 1898898961 is about 43576.3578216445. The cubic root of 1898898961 is about 1238.3230368348.

The spelling of 1898898961 in words is "one billion, eight hundred ninety-eight million, eight hundred ninety-eight thousand, nine hundred sixty-one".