1945381143 has 4 divisors (see below), whose sum is σ = 2593841528. Its totient is φ = 1296920760.

The previous prime is 1945381121. The next prime is 1945381159. The reversal of 1945381143 is 3411835491.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1945381143 - 2⁸ = 1945380887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1945381343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324230188 + ... + 324230193.

It is an arithmetic number, because the mean of its divisors is an integer number (648460382).

Almost surely, 2^1945381143 is an apocalyptic number.

1945381143 is a deficient number, since it is larger than the sum of its proper divisors (648460385).

1945381143 is an equidigital number, since it uses as much as digits as its factorization.

1945381143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648460384.

The product of its digits is 51840, while the sum is 39.

The square root of 1945381143 is about 44106.4750688604. The cubic root of 1945381143 is about 1248.3457890078.

The spelling of 1945381143 in words is "one billion, nine hundred forty-five million, three hundred eighty-one thousand, one hundred forty-three".