797457681 has 6 divisors (see below), whose sum is σ = 1151883330. Its totient is φ = 531638448.

The previous prime is 797457649. The next prime is 797457691. The reversal of 797457681 is 186754797.

It can be written as a sum of positive squares in only one way, i.e., 502477056 + 294980625 = 22416^2 + 17175^2 .

It is not a de Polignac number, because 797457681 - 2⁵ = 797457649 is a prime.

It is a super-2 number, since 2×797457681² = 1271877505971795522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (797457691) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44303196 + ... + 44303213.

It is an arithmetic number, because the mean of its divisors is an integer number (191980555).

Almost surely, 2^797457681 is an apocalyptic number.

It is an amenable number.

797457681 is a deficient number, since it is larger than the sum of its proper divisors (354425649).

797457681 is a wasteful number, since it uses less digits than its factorization.

797457681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88606415 (or 88606412 counting only the distinct ones).

The product of its digits is 2963520, while the sum is 54.

The square root of 797457681 is about 28239.2932099938. The cubic root of 797457681 is about 927.3333565762. Note that the first 4 decimals are identical.

The spelling of 797457681 in words is "seven hundred ninety-seven million, four hundred fifty-seven thousand, six hundred eighty-one".