1945381069 has 2 divisors, whose sum is σ = 1945381070. Its totient is φ = 1945381068.

The previous prime is 1945381057. The next prime is 1945381091. The reversal of 1945381069 is 9601835491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1937144169 + 8236900 = 44013^2 + 2870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1945381069 is a prime.

It is a super-2 number, since 2×1945381069² = 7569015007247165522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1945381019) 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 as a sum of consecutive naturals, namely, 972690534 + 972690535.

It is an arithmetic number, because the mean of its divisors is an integer number (972690535).

Almost surely, 2^1945381069 is an apocalyptic number.

It is an amenable number.

1945381069 is a deficient number, since it is larger than the sum of its proper divisors (1).

1945381069 is an equidigital number, since it uses as much as digits as its factorization.

1945381069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 1945381069 is about 44106.4742299812. The cubic root of 1945381069 is about 1248.3457731793.

The spelling of 1945381069 in words is "one billion, nine hundred forty-five million, three hundred eighty-one thousand, sixty-nine".