797798621 has 4 divisors (see below), whose sum is σ = 800638044. Its totient is φ = 794959200.

The previous prime is 797798611. The next prime is 797798629. The reversal of 797798621 is 126897797.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126897797 = 13 ⋅9761369.

It can be written as a sum of positive squares in 2 ways, for example, as 353853721 + 443944900 = 18811^2 + 21070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-797798621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (797798629) 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, 1419290 + ... + 1419851.

It is an arithmetic number, because the mean of its divisors is an integer number (200159511).

Almost surely, 2^797798621 is an apocalyptic number.

It is an amenable number.

797798621 is a deficient number, since it is larger than the sum of its proper divisors (2839423).

797798621 is a wasteful number, since it uses less digits than its factorization.

797798621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2839422.

The product of its digits is 2667168, while the sum is 56.

The square root of 797798621 is about 28245.3291890889. The cubic root of 797798621 is about 927.4654931546.

The spelling of 797798621 in words is "seven hundred ninety-seven million, seven hundred ninety-eight thousand, six hundred twenty-one".