1991562 has 16 divisors (see below), whose sum is σ = 4091232. Its totient is φ = 645840.

The previous prime is 1991551. The next prime is 1991573. The reversal of 1991562 is 2651991.

It is an interprime number because it is at equal distance from previous prime (1991551) and next prime (1991573).

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 7 ways as a sum of consecutive naturals, for example, 4264 + ... + 4707.

It is an arithmetic number, because the mean of its divisors is an integer number (255702).

2^1991562 is an apocalyptic number.

1991562 is an abundant number, since it is smaller than the sum of its proper divisors (2099670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1991562 is a wasteful number, since it uses less digits than its factorization.

1991562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9013.

The product of its digits is 4860, while the sum is 33.

The square root of 1991562 is about 1411.2271255896. The cubic root of 1991562 is about 125.8146683230.

The spelling of 1991562 in words is "one million, nine hundred ninety-one thousand, five hundred sixty-two".