1991093 has 8 divisors (see below), whose sum is σ = 2166528. Its totient is φ = 1818864.

The previous prime is 1991089. The next prime is 1991107. The reversal of 1991093 is 3901991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1991093 - 2² = 1991089 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1991063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 596 + ... + 2082.

It is an arithmetic number, because the mean of its divisors is an integer number (270816).

2^1991093 is an apocalyptic number.

1991093 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1991093 is a deficient number, since it is larger than the sum of its proper divisors (175435).

1991093 is a wasteful number, since it uses less digits than its factorization.

1991093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603.

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

The square root of 1991093 is about 1411.0609483647. The cubic root of 1991093 is about 125.8047913667.

The spelling of 1991093 in words is "one million, nine hundred ninety-one thousand, ninety-three".