10991097 has 12 divisors (see below), whose sum is σ = 17097444. Its totient is φ = 6763680.

The previous prime is 10991089. The next prime is 10991107. The reversal of 10991097 is 79019901.

It can be written as a sum of positive squares in 2 ways, for example, as 2134521 + 8856576 = 1461^2 + 2976^2 .

It is not a de Polignac number, because 10991097 - 2³ = 10991089 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (10991077) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46854 + ... + 47087.

It is an arithmetic number, because the mean of its divisors is an integer number (1424787).

Almost surely, 2^10991097 is an apocalyptic number.

It is an amenable number.

10991097 is a deficient number, since it is larger than the sum of its proper divisors (6106347).

10991097 is a wasteful number, since it uses less digits than its factorization.

10991097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93960 (or 93957 counting only the distinct ones).

The product of its (nonzero) digits is 5103, while the sum is 36.

The square root of 10991097 is about 3315.2823409176. The cubic root of 10991097 is about 222.3379925752.

The spelling of 10991097 in words is "ten million, nine hundred ninety-one thousand, ninety-seven".