1940454991 has 2 divisors, whose sum is σ = 1940454992. Its totient is φ = 1940454990.

The previous prime is 1940454983. The next prime is 1940455001. The reversal of 1940454991 is 1994540491.

It is a weak prime.

It is an emirp because it is prime and its reverse (1994540491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1940454991 - 2³ = 1940454983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1940454911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 970227495 + 970227496.

It is an arithmetic number, because the mean of its divisors is an integer number (970227496).

Almost surely, 2^1940454991 is an apocalyptic number.

1940454991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1940454991 is an equidigital number, since it uses as much as digits as its factorization.

1940454991 is an evil number, because the sum of its binary digits is even.

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

The square root of 1940454991 is about 44050.5958075484. The cubic root of 1940454991 is about 1247.2911989042.

The spelling of 1940454991 in words is "one billion, nine hundred forty million, four hundred fifty-four thousand, nine hundred ninety-one".