1991316 has 48 divisors (see below), whose sum is σ = 4935168. Its totient is φ = 624000.

The previous prime is 1991293. The next prime is 1991351. The reversal of 1991316 is 6131991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19666 + ... + 19766.

It is an arithmetic number, because the mean of its divisors is an integer number (102816).

2^1991316 is an apocalyptic number.

It is an amenable number.

1991316 is an abundant number, since it is smaller than the sum of its proper divisors (2943852).

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

1991316 is a wasteful number, since it uses less digits than its factorization.

1991316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 190 counting only the distinct ones).

The product of its digits is 1458, while the sum is 30.

The square root of 1991316 is about 1411.1399647094. The cubic root of 1991316 is about 125.8094878527.

The spelling of 1991316 in words is "one million, nine hundred ninety-one thousand, three hundred sixteen".