1849798921 has 2 divisors, whose sum is σ = 1849798922. Its totient is φ = 1849798920.

The previous prime is 1849798889. The next prime is 1849798931. The reversal of 1849798921 is 1298979481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1358733321 + 491065600 = 36861^2 + 22160^2 .

It is a cyclic number.

It is not a de Polignac number, because 1849798921 - 2⁵ = 1849798889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1849798931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 924899460 + 924899461.

It is an arithmetic number, because the mean of its divisors is an integer number (924899461).

Almost surely, 2^1849798921 is an apocalyptic number.

It is an amenable number.

1849798921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1849798921 is an equidigital number, since it uses as much as digits as its factorization.

1849798921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 58.

The square root of 1849798921 is about 43009.2887757982. The cubic root of 1849798921 is about 1227.5565480425.

The spelling of 1849798921 in words is "one billion, eight hundred forty-nine million, seven hundred ninety-eight thousand, nine hundred twenty-one".