1091697 has 8 divisors (see below), whose sum is σ = 1470144. Its totient is φ = 720528.

The previous prime is 1091687. The next prime is 1091711. The reversal of 1091697 is 7961901.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1091697 - 2⁴ = 1091681 is a prime.

It is an Ulam number.

1091697 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1091617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1458 + ... + 2075.

It is an arithmetic number, because the mean of its divisors is an integer number (183768).

2^1091697 is an apocalyptic number.

It is an amenable number.

1091697 is a deficient number, since it is larger than the sum of its proper divisors (378447).

1091697 is a wasteful number, since it uses less digits than its factorization.

1091697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3639.

The product of its (nonzero) digits is 3402, while the sum is 33.

The square root of 1091697 is about 1044.8430504148. The cubic root of 1091697 is about 102.9676273669.

The spelling of 1091697 in words is "one million, ninety-one thousand, six hundred ninety-seven".