1069797821 has 2 divisors, whose sum is σ = 1069797822. Its totient is φ = 1069797820.

The previous prime is 1069797797. The next prime is 1069797857. The reversal of 1069797821 is 1287979601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 599515225 + 470282596 = 24485^2 + 21686^2 .

It is an emirp because it is prime and its reverse (1287979601) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1069797821 is a prime.

It is a super-2 number, since 2×1069797821² = 2288934755632696082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1069797821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1069797121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 534898910 + 534898911.

It is an arithmetic number, because the mean of its divisors is an integer number (534898911).

Almost surely, 2^1069797821 is an apocalyptic number.

It is an amenable number.

1069797821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1069797821 is an equidigital number, since it uses as much as digits as its factorization.

1069797821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 50.

The square root of 1069797821 is about 32707.7639254046. The cubic root of 1069797821 is about 1022.7446969873.

The spelling of 1069797821 in words is "one billion, sixty-nine million, seven hundred ninety-seven thousand, eight hundred twenty-one".