1945490791 has 2 divisors, whose sum is σ = 1945490792. Its totient is φ = 1945490790.

The previous prime is 1945490779. The next prime is 1945490803. The reversal of 1945490791 is 1970945491.

It is a balanced prime because it is at equal distance from previous prime (1945490779) and next prime (1945490803).

It is an emirp because it is prime and its reverse (1970945491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1945490791 - 2⁹ = 1945490279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1945490741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972745395 + 972745396.

It is an arithmetic number, because the mean of its divisors is an integer number (972745396).

Almost surely, 2^1945490791 is an apocalyptic number.

1945490791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1945490791 is an equidigital number, since it uses as much as digits as its factorization.

1945490791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 49.

The square root of 1945490791 is about 44107.7180434445. The cubic root of 1945490791 is about 1248.3692421750.

The spelling of 1945490791 in words is "one billion, nine hundred forty-five million, four hundred ninety thousand, seven hundred ninety-one".