1097278321 has 4 divisors (see below), whose sum is σ = 1111168000. Its totient is φ = 1083388644.

The previous prime is 1097278297. The next prime is 1097278331. The reversal of 1097278321 is 1238727901.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1238727901 = 127 ⋅9753763.

It is a cyclic number.

It is not a de Polignac number, because 1097278321 - 2⁵ = 1097278289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1097278331) 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, 6944721 + ... + 6944878.

It is an arithmetic number, because the mean of its divisors is an integer number (277792000).

Almost surely, 2^1097278321 is an apocalyptic number.

It is an amenable number.

1097278321 is a deficient number, since it is larger than the sum of its proper divisors (13889679).

1097278321 is an equidigital number, since it uses as much as digits as its factorization.

1097278321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13889678.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 1097278321 is about 33125.1916371815. The cubic root of 1097278321 is about 1031.4280380411.

The spelling of 1097278321 in words is "one billion, ninety-seven million, two hundred seventy-eight thousand, three hundred twenty-one".