1991353 has 16 divisors (see below), whose sum is σ = 2490880. Its totient is φ = 1550016.

The previous prime is 1991351. The next prime is 1991357. The reversal of 1991353 is 3531991.

It is not a de Polignac number, because 1991353 - 2¹ = 1991351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1991351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7051 + ... + 7327.

It is an arithmetic number, because the mean of its divisors is an integer number (155680).

2^1991353 is an apocalyptic number.

1991353 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1991353 is a deficient number, since it is larger than the sum of its proper divisors (499527).

1991353 is a wasteful number, since it uses less digits than its factorization.

1991353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376.

The product of its digits is 3645, while the sum is 31.

The square root of 1991353 is about 1411.1530746166. The cubic root of 1991353 is about 125.8102670564.

The spelling of 1991353 in words is "one million, nine hundred ninety-one thousand, three hundred fifty-three".