1091819983 has 2 divisors, whose sum is σ = 1091819984. Its totient is φ = 1091819982.

The previous prime is 1091819977. The next prime is 1091820001. The reversal of 1091819983 is 3899181901.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1091819983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091819903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545909991 + 545909992.

It is an arithmetic number, because the mean of its divisors is an integer number (545909992).

Almost surely, 2^1091819983 is an apocalyptic number.

1091819983 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091819983 is an equidigital number, since it uses as much as digits as its factorization.

1091819983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 49.

The square root of 1091819983 is about 33042.6993903343. The cubic root of 1091819983 is about 1029.7149376090.

The spelling of 1091819983 in words is "one billion, ninety-one million, eight hundred nineteen thousand, nine hundred eighty-three".