1081220797 has 4 divisors (see below), whose sum is σ = 1083661920. Its totient is φ = 1078779676.

The previous prime is 1081220779. The next prime is 1081220801. The reversal of 1081220797 is 7970221801.

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: 7970221801 = 509 ⋅15658589.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1081220797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081220197) 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, 1219897 + ... + 1220782.

It is an arithmetic number, because the mean of its divisors is an integer number (270915480).

Almost surely, 2^1081220797 is an apocalyptic number.

It is an amenable number.

1081220797 is a deficient number, since it is larger than the sum of its proper divisors (2441123).

1081220797 is an equidigital number, since it uses as much as digits as its factorization.

1081220797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2441122.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 1081220797 is about 32881.9220393212. The cubic root of 1081220797 is about 1026.3720027170.

The spelling of 1081220797 in words is "one billion, eighty-one million, two hundred twenty thousand, seven hundred ninety-seven".