797781289 has 4 divisors (see below), whose sum is σ = 832467456. Its totient is φ = 763095124.

The previous prime is 797781251. The next prime is 797781301. The reversal of 797781289 is 982187797.

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: 982187797 = 383 ⋅2564459.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-797781289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (797781209) 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, 17343049 + ... + 17343094.

It is an arithmetic number, because the mean of its divisors is an integer number (208116864).

Almost surely, 2^797781289 is an apocalyptic number.

It is an amenable number.

797781289 is a deficient number, since it is larger than the sum of its proper divisors (34686167).

797781289 is a wasteful number, since it uses less digits than its factorization.

797781289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34686166.

The product of its digits is 3556224, while the sum is 58.

The square root of 797781289 is about 28245.0223756328. The cubic root of 797781289 is about 927.4587767779.

The spelling of 797781289 in words is "seven hundred ninety-seven million, seven hundred eighty-one thousand, two hundred eighty-nine".