1848649681 has 2 divisors, whose sum is σ = 1848649682. Its totient is φ = 1848649680.

The previous prime is 1848649661. The next prime is 1848649741. The reversal of 1848649681 is 1869468481.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1798523281 + 50126400 = 42409^2 + 7080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1848649681 is a prime.

It is a super-2 number, since 2×1848649681² = 6835011286122803522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1848649601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 924324840 + 924324841.

It is an arithmetic number, because the mean of its divisors is an integer number (924324841).

Almost surely, 2^1848649681 is an apocalyptic number.

It is an amenable number.

1848649681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1848649681 is an equidigital number, since it uses as much as digits as its factorization.

1848649681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2654208, while the sum is 55.

The square root of 1848649681 is about 42995.9263302932. The cubic root of 1848649681 is about 1227.3022772801.

The spelling of 1848649681 in words is "one billion, eight hundred forty-eight million, six hundred forty-nine thousand, six hundred eighty-one".