1091983 has 2 divisors, whose sum is σ = 1091984. Its totient is φ = 1091982.

The previous prime is 1091957. The next prime is 1092019. The reversal of 1091983 is 3891901.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1091983 - 2⁹ = 1091471 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1094983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545991 + 545992.

It is an arithmetic number, because the mean of its divisors is an integer number (545992).

2^1091983 is an apocalyptic number.

1091983 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091983 is an equidigital number, since it uses as much as digits as its factorization.

1091983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 1091983 is about 1044.9799041130. The cubic root of 1091983 is about 102.9766183141.

The spelling of 1091983 in words is "one million, ninety-one thousand, nine hundred eighty-three".