991053 has 12 divisors (see below), whose sum is σ = 1636128. Its totient is φ = 566280.

The previous prime is 991043. The next prime is 991057. The reversal of 991053 is 350199.

It is not a de Polignac number, because 991053 - 2⁴ = 991037 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

991053 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7803 + ... + 7928.

It is an arithmetic number, because the mean of its divisors is an integer number (136344).

2⁹⁹¹⁰⁵³ is an apocalyptic number.

It is an amenable number.

991053 is a deficient number, since it is larger than the sum of its proper divisors (645075).

991053 is a wasteful number, since it uses less digits than its factorization.

991053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15744 (or 15741 counting only the distinct ones).

The product of its (nonzero) digits is 1215, while the sum is 27.

The square root of 991053 is about 995.5164488847. The cubic root of 991053 is about 99.7008727879.

The spelling of 991053 in words is "nine hundred ninety-one thousand, fifty-three".