1848985561 has 2 divisors, whose sum is σ = 1848985562. Its totient is φ = 1848985560.

The previous prime is 1848985559. The next prime is 1848985657. The reversal of 1848985561 is 1655898481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1842126400 + 6859161 = 42920^2 + 2619^2 .

It is a cyclic number.

It is not a de Polignac number, because 1848985561 - 2¹ = 1848985559 is a prime.

Together with 1848985559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1848985511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 924492780 + 924492781.

It is an arithmetic number, because the mean of its divisors is an integer number (924492781).

Almost surely, 2^1848985561 is an apocalyptic number.

It is an amenable number.

1848985561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1848985561 is an equidigital number, since it uses as much as digits as its factorization.

1848985561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2764800, while the sum is 55.

The square root of 1848985561 is about 42999.8321043234. The cubic root of 1848985561 is about 1227.3766020390.

The spelling of 1848985561 in words is "one billion, eight hundred forty-eight million, nine hundred eighty-five thousand, five hundred sixty-one".