797551681 has 2 divisors, whose sum is σ = 797551682. Its totient is φ = 797551680.

The previous prime is 797551669. The next prime is 797551691. The reversal of 797551681 is 186155797.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 708890625 + 88661056 = 26625^2 + 9416^2 .

It is a cyclic number.

It is not a de Polignac number, because 797551681 - 2²³ = 789163073 is a prime.

It is a super-2 number, since 2×797551681² = 1272177367731851522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (797551691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 398775840 + 398775841.

It is an arithmetic number, because the mean of its divisors is an integer number (398775841).

Almost surely, 2^797551681 is an apocalyptic number.

It is an amenable number.

797551681 is a deficient number, since it is larger than the sum of its proper divisors (1).

797551681 is an equidigital number, since it uses as much as digits as its factorization.

797551681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 529200, while the sum is 49.

The square root of 797551681 is about 28240.9575085548. The cubic root of 797551681 is about 927.3697914922.

The spelling of 797551681 in words is "seven hundred ninety-seven million, five hundred fifty-one thousand, six hundred eighty-one".