1944051491 has 2 divisors, whose sum is σ = 1944051492. Its totient is φ = 1944051490.

The previous prime is 1944051467. The next prime is 1944051523. The reversal of 1944051491 is 1941504491.

It is a weak prime.

It is an emirp because it is prime and its reverse (1941504491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1944051491 - 2⁶ = 1944051427 is a prime.

It is not a weakly prime, because it can be changed into another prime (1944051091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972025745 + 972025746.

It is an arithmetic number, because the mean of its divisors is an integer number (972025746).

Almost surely, 2^1944051491 is an apocalyptic number.

1944051491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1944051491 is an equidigital number, since it uses as much as digits as its factorization.

1944051491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 1944051491 is about 44091.3992860286. The cubic root of 1944051491 is about 1248.0613128281.

The spelling of 1944051491 in words is "one billion, nine hundred forty-four million, fifty-one thousand, four hundred ninety-one".