1991062 has 4 divisors (see below), whose sum is σ = 2986596. Its totient is φ = 995530.

The previous prime is 1991047. The next prime is 1991063. The reversal of 1991062 is 2601991.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1991062.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497764 + ... + 497767.

It is an arithmetic number, because the mean of its divisors is an integer number (746649).

2^1991062 is an apocalyptic number.

1991062 is a deficient number, since it is larger than the sum of its proper divisors (995534).

1991062 is an equidigital number, since it uses as much as digits as its factorization.

1991062 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 995533.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 1991062 is about 1411.0499636795. The cubic root of 1991062 is about 125.8041384643.

The spelling of 1991062 in words is "one million, nine hundred ninety-one thousand, sixty-two".