1085297921 has 4 divisors (see below), whose sum is σ = 1111768644. Its totient is φ = 1058827200.

The previous prime is 1085297903. The next prime is 1085297929. The reversal of 1085297921 is 1297925801.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1297925801 = 233 ⋅5570497.

It can be written as a sum of positive squares in 2 ways, for example, as 63600625 + 1021697296 = 7975^2 + 31964^2 .

It is a cyclic number.

It is not a de Polignac number, because 1085297921 - 2¹⁴ = 1085281537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1085297929) 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, 13235300 + ... + 13235381.

It is an arithmetic number, because the mean of its divisors is an integer number (277942161).

Almost surely, 2^1085297921 is an apocalyptic number.

It is an amenable number.

1085297921 is a deficient number, since it is larger than the sum of its proper divisors (26470723).

1085297921 is an equidigital number, since it uses as much as digits as its factorization.

1085297921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26470722.

The product of its (nonzero) digits is 90720, while the sum is 44.

The square root of 1085297921 is about 32943.8601411553. The cubic root of 1085297921 is about 1027.6604836126.

The spelling of 1085297921 in words is "one billion, eighty-five million, two hundred ninety-seven thousand, nine hundred twenty-one".