1097749 has 4 divisors (see below), whose sum is σ = 1109164. Its totient is φ = 1086336.

The previous prime is 1097743. The next prime is 1097783. The reversal of 1097749 is 9477901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9477901 = 2777 ⋅3413.

It can be written as a sum of positive squares in 2 ways, for example, as 842724 + 255025 = 918^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 1097749 - 2⁵ = 1097717 is a prime.

It is a Duffinian number.

1097749 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1097743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5562 + ... + 5755.

It is an arithmetic number, because the mean of its divisors is an integer number (277291).

2^1097749 is an apocalyptic number.

It is an amenable number.

1097749 is a deficient number, since it is larger than the sum of its proper divisors (11415).

1097749 is an equidigital number, since it uses as much as digits as its factorization.

1097749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11414.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 1097749 is about 1047.7351764640. The cubic root of 1097749 is about 103.1575494437.

It can be divided in two parts, 10977 and 49, that added together give a triangular number (11026 = T₁₄₈).

The spelling of 1097749 in words is "one million, ninety-seven thousand, seven hundred forty-nine".