10991012 has 6 divisors (see below), whose sum is σ = 19234278. Its totient is φ = 5495504.

The previous prime is 10991011. The next prime is 10991021. The reversal of 10991012 is 21019901.

It can be written as a sum of positive squares in only one way, i.e., 7365796 + 3625216 = 2714^2 + 1904^2 .

It is not an unprimeable number, because it can be changed into a prime (10991011) 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 as a sum of consecutive naturals, namely, 1373873 + ... + 1373880.

It is an arithmetic number, because the mean of its divisors is an integer number (3205713).

Almost surely, 2^10991012 is an apocalyptic number.

It is an amenable number.

10991012 is a deficient number, since it is larger than the sum of its proper divisors (8243266).

10991012 is a wasteful number, since it uses less digits than its factorization.

10991012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2747757 (or 2747755 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 10991012 is about 3315.2695214718. The cubic root of 10991012 is about 222.3374194211.

The spelling of 10991012 in words is "ten million, nine hundred ninety-one thousand, twelve".