1091939 has 2 divisors, whose sum is σ = 1091940. Its totient is φ = 1091938.

The previous prime is 1091917. The next prime is 1091957. The reversal of 1091939 is 9391901.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1091939 - 2¹² = 1087843 is a prime.

It is a super-3 number, since 3×1091939³ = 3905857437833307057, which contains 333 as substring.

It is a Chen prime.

It is an Ulam number.

It is a plaindrome in base 12.

It is not a weakly prime, because it can be changed into another prime (1091239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545969 + 545970.

It is an arithmetic number, because the mean of its divisors is an integer number (545970).

2^1091939 is an apocalyptic number.

1091939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091939 is an equidigital number, since it uses as much as digits as its factorization.

1091939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2187, while the sum is 32.

The square root of 1091939 is about 1044.9588508645. The cubic root of 1091939 is about 102.9752351936.

It can be divided in two parts, 109 and 1939, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 1091939 in words is "one million, ninety-one thousand, nine hundred thirty-nine".