1991054 has 8 divisors (see below), whose sum is σ = 3216360. Its totient is φ = 918936.

The previous prime is 1991047. The next prime is 1991063. The reversal of 1991054 is 4501991.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38264 + ... + 38315.

It is an arithmetic number, because the mean of its divisors is an integer number (402045).

2^1991054 is an apocalyptic number.

1991054 is a deficient number, since it is larger than the sum of its proper divisors (1225306).

1991054 is a wasteful number, since it uses less digits than its factorization.

1991054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76594.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 1991054 is about 1411.0471289082. The cubic root of 1991054 is about 125.8039699722.

The spelling of 1991054 in words is "one million, nine hundred ninety-one thousand, fifty-four".