1097491 has 4 divisors (see below), whose sum is σ = 1145232. Its totient is φ = 1049752.

The previous prime is 1097483. The next prime is 1097501. The reversal of 1097491 is 1947901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1947901 = 29 ⋅67169.

It is a cyclic number.

It is not a de Polignac number, because 1097491 - 2³ = 1097483 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1097441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23836 + ... + 23881.

It is an arithmetic number, because the mean of its divisors is an integer number (286308).

2^1097491 is an apocalyptic number.

1097491 is a deficient number, since it is larger than the sum of its proper divisors (47741).

1097491 is an equidigital number, since it uses as much as digits as its factorization.

1097491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47740.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 1097491 is about 1047.6120465134. The cubic root of 1097491 is about 103.1494672279.

The spelling of 1097491 in words is "one million, ninety-seven thousand, four hundred ninety-one".