10991290 has 32 divisors (see below), whose sum is σ = 20684160. Its totient is φ = 4200000.

The previous prime is 10991269. The next prime is 10991311. The reversal of 10991290 is 9219901.

It is an interprime number because it is at equal distance from previous prime (10991269) and next prime (10991311).

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, 43665 + ... + 43915.

It is an arithmetic number, because the mean of its divisors is an integer number (646380).

Almost surely, 2^10991290 is an apocalyptic number.

10991290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

10991290 is a deficient number, since it is larger than the sum of its proper divisors (9692870).

10991290 is a wasteful number, since it uses less digits than its factorization.

10991290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 10991290 is about 3315.3114484163. The cubic root of 10991290 is about 222.3392939613.

The spelling of 10991290 in words is "ten million, nine hundred ninety-one thousand, two hundred ninety".