991130 has 16 divisors (see below), whose sum is σ = 2039040. Its totient is φ = 339792.

The previous prime is 991129. The next prime is 991147. The reversal of 991130 is 31199.

991130 = T₃₅₆ + T₃₅₇ + ... + T₃₇₀.

It is a junction number, because it is equal to n+sod(n) for n = 991096 and 991105.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7010 + ... + 7149.

It is an arithmetic number, because the mean of its divisors is an integer number (127440).

2⁹⁹¹¹³⁰ is an apocalyptic number.

991130 is an abundant number, since it is smaller than the sum of its proper divisors (1047910).

It is a weird number, because it is abundant, but not a pseudoperfect number.

991130 is a wasteful number, since it uses less digits than its factorization.

991130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14173.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 991130 is about 995.5551215277. Note that the first 3 decimals coincide. The cubic root of 991130 is about 99.7034548121.

The spelling of 991130 in words is "nine hundred ninety-one thousand, one hundred thirty".