1849688081 has 2 divisors, whose sum is σ = 1849688082. Its totient is φ = 1849688080.

The previous prime is 1849688047. The next prime is 1849688107. The reversal of 1849688081 is 1808869481.

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., 1067982400 + 781705681 = 32680^2 + 27959^2 .

It is a cyclic number.

It is not a de Polignac number, because 1849688081 - 2⁶ = 1849688017 is a prime.

It is a super-2 number, since 2×1849688081² = 6842691993986925122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1849688041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 924844040 + 924844041.

It is an arithmetic number, because the mean of its divisors is an integer number (924844041).

Almost surely, 2^1849688081 is an apocalyptic number.

It is an amenable number.

1849688081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1849688081 is an equidigital number, since it uses as much as digits as its factorization.

1849688081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 884736, while the sum is 53.

The square root of 1849688081 is about 43008.0001976376. Note that the first 3 decimals coincide. The cubic root of 1849688081 is about 1227.5320291459.

The spelling of 1849688081 in words is "one billion, eight hundred forty-nine million, six hundred eighty-eight thousand, eighty-one".