991070 has 32 divisors (see below), whose sum is σ = 1935360. Its totient is φ = 364320.

The previous prime is 991069. The next prime is 991073. The reversal of 991070 is 70199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991073) 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, 7061 + ... + 7199.

It is an arithmetic number, because the mean of its divisors is an integer number (60480).

2⁹⁹¹⁰⁷⁰ is an apocalyptic number.

991070 is a deficient number, since it is larger than the sum of its proper divisors (944290).

991070 is a wasteful number, since it uses less digits than its factorization.

991070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200.

The product of its (nonzero) digits is 567, while the sum is 26.

The square root of 991070 is about 995.5249871299. The cubic root of 991070 is about 99.7014428567.

The spelling of 991070 in words is "nine hundred ninety-one thousand, seventy".