1945201871 has 2 divisors, whose sum is σ = 1945201872. Its totient is φ = 1945201870.

The previous prime is 1945201849. The next prime is 1945201877. The reversal of 1945201871 is 1781025491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1945201871 - 2¹⁸ = 1944939727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1945201877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972600935 + 972600936.

It is an arithmetic number, because the mean of its divisors is an integer number (972600936).

Almost surely, 2^1945201871 is an apocalyptic number.

1945201871 is a deficient number, since it is larger than the sum of its proper divisors (1).

1945201871 is an equidigital number, since it uses as much as digits as its factorization.

1945201871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 1945201871 is about 44104.4427580714. The cubic root of 1945201871 is about 1248.3074417116.

The spelling of 1945201871 in words is "one billion, nine hundred forty-five million, two hundred one thousand, eight hundred seventy-one".