1949945771 has 2 divisors, whose sum is σ = 1949945772. Its totient is φ = 1949945770.

The previous prime is 1949945731. The next prime is 1949945801. The reversal of 1949945771 is 1775499491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1949945771 - 2⁶ = 1949945707 is a prime.

It is not a weakly prime, because it can be changed into another prime (1949945731) 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, 974972885 + 974972886.

It is an arithmetic number, because the mean of its divisors is an integer number (974972886).

Almost surely, 2^1949945771 is an apocalyptic number.

1949945771 is a deficient number, since it is larger than the sum of its proper divisors (1).

1949945771 is an equidigital number, since it uses as much as digits as its factorization.

1949945771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2857680, while the sum is 56.

The square root of 1949945771 is about 44158.1903048574. The cubic root of 1949945771 is about 1249.3213961441.

The spelling of 1949945771 in words is "one billion, nine hundred forty-nine million, nine hundred forty-five thousand, seven hundred seventy-one".