1945201849 has 2 divisors, whose sum is σ = 1945201850. Its totient is φ = 1945201848.

The previous prime is 1945201823. The next prime is 1945201871. The reversal of 1945201849 is 9481025491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1396143225 + 549058624 = 37365^2 + 23432^2 .

It is a cyclic number.

It is not a de Polignac number, because 1945201849 - 2⁷ = 1945201721 is a prime.

It is not a weakly prime, because it can be changed into another prime (1945201949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972600924 + 972600925.

It is an arithmetic number, because the mean of its divisors is an integer number (972600925).

Almost surely, 2^1945201849 is an apocalyptic number.

It is an amenable number.

1945201849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1945201849 is an equidigital number, since it uses as much as digits as its factorization.

1945201849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 1945201849 is about 44104.4425086635. The cubic root of 1945201849 is about 1248.3074370055.

The spelling of 1945201849 in words is "one billion, nine hundred forty-five million, two hundred one thousand, eight hundred forty-nine".