1850821249 has 2 divisors, whose sum is σ = 1850821250. Its totient is φ = 1850821248.

The previous prime is 1850821213. The next prime is 1850821261. The reversal of 1850821249 is 9421280581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1096934400 + 753886849 = 33120^2 + 27457^2 .

It is a cyclic number.

It is not a de Polignac number, because 1850821249 - 2⁷ = 1850821121 is a prime.

It is not a weakly prime, because it can be changed into another prime (1850821649) 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, 925410624 + 925410625.

It is an arithmetic number, because the mean of its divisors is an integer number (925410625).

Almost surely, 2^1850821249 is an apocalyptic number.

It is an amenable number.

1850821249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1850821249 is an equidigital number, since it uses as much as digits as its factorization.

1850821249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 1850821249 is about 43021.1721016525. The cubic root of 1850821249 is about 1227.7826508716.

The spelling of 1850821249 in words is "one billion, eight hundred fifty million, eight hundred twenty-one thousand, two hundred forty-nine".