10991351 has 4 divisors (see below), whose sum is σ = 12561552. Its totient is φ = 9421152.

The previous prime is 10991347. The next prime is 10991363. The reversal of 10991351 is 15319901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15319901 = 271 ⋅56531.

It is a cyclic number.

It is not a de Polignac number, because 10991351 - 2² = 10991347 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10991311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 785090 + ... + 785103.

It is an arithmetic number, because the mean of its divisors is an integer number (3140388).

Almost surely, 2^10991351 is an apocalyptic number.

10991351 is a deficient number, since it is larger than the sum of its proper divisors (1570201).

10991351 is an equidigital number, since it uses as much as digits as its factorization.

10991351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570200.

The product of its (nonzero) digits is 1215, while the sum is 29.

The square root of 10991351 is about 3315.3206481425. The cubic root of 10991351 is about 222.3397052770.

The spelling of 10991351 in words is "ten million, nine hundred ninety-one thousand, three hundred fifty-one".