13091697 has 6 divisors (see below), whose sum is σ = 18910242. Its totient is φ = 8727792.

The previous prime is 13091693. The next prime is 13091699. The reversal of 13091697 is 79619031.

It can be written as a sum of positive squares in only one way, i.e., 11128896 + 1962801 = 3336^2 + 1401^2 .

It is not a de Polignac number, because 13091697 - 2² = 13091693 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13091693) 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 in 5 ways as a sum of consecutive naturals, for example, 727308 + ... + 727325.

It is an arithmetic number, because the mean of its divisors is an integer number (3151707).

Almost surely, 2^13091697 is an apocalyptic number.

It is an amenable number.

13091697 is a deficient number, since it is larger than the sum of its proper divisors (5818545).

13091697 is a wasteful number, since it uses less digits than its factorization.

13091697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1454639 (or 1454636 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 13091697 is about 3618.2450165792. The cubic root of 13091697 is about 235.6850210028.

The spelling of 13091697 in words is "thirteen million, ninety-one thousand, six hundred ninety-seven".