991270 has 48 divisors (see below), whose sum is σ = 2210400. Its totient is φ = 319872.

The previous prime is 991261. The next prime is 991273. The reversal of 991270 is 72199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991273) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58302 + ... + 58318.

It is an arithmetic number, because the mean of its divisors is an integer number (46050).

2⁹⁹¹²⁷⁰ is an apocalyptic number.

991270 is an abundant number, since it is smaller than the sum of its proper divisors (1219130).

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

991270 is a wasteful number, since it uses less digits than its factorization.

991270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62 (or 31 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 991270 is about 995.6254315755. The cubic root of 991270 is about 99.7081490589.

It can be divided in two parts, 99 and 1270, that added together give a square (1369 = 37²).

The spelling of 991270 in words is "nine hundred ninety-one thousand, two hundred seventy".