1097391 has 4 divisors (see below), whose sum is σ = 1463192. Its totient is φ = 731592.

The previous prime is 1097381. The next prime is 1097413. The reversal of 1097391 is 1937901.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1097391 - 2⁵ = 1097359 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1097321) 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 3 ways as a sum of consecutive naturals, for example, 182896 + ... + 182901.

It is an arithmetic number, because the mean of its divisors is an integer number (365798).

2^1097391 is an apocalyptic number.

1097391 is a deficient number, since it is larger than the sum of its proper divisors (365801).

1097391 is an equidigital number, since it uses as much as digits as its factorization.

1097391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365800.

The product of its (nonzero) digits is 1701, while the sum is 30.

The square root of 1097391 is about 1047.5643178345. The cubic root of 1097391 is about 103.1463342454.

Adding to 1097391 its sum of digits (30), we get a triangular number (1097421 = T₁₄₈₁).

The spelling of 1097391 in words is "one million, ninety-seven thousand, three hundred ninety-one".