200779681 has 2 divisors, whose sum is σ = 200779682. Its totient is φ = 200779680.

The previous prime is 200779679. The next prime is 200779697. The reversal of 200779681 is 186977002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169520400 + 31259281 = 13020^2 + 5591^2 .

It is a cyclic number.

It is not a de Polignac number, because 200779681 - 2¹ = 200779679 is a prime.

It is a super-2 number, since 2×200779681² = 80624960604923522, which contains 22 as substring.

Together with 200779679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (200779661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100389840 + 100389841.

It is an arithmetic number, because the mean of its divisors is an integer number (100389841).

Almost surely, 2^200779681 is an apocalyptic number.

It is an amenable number.

200779681 is a deficient number, since it is larger than the sum of its proper divisors (1).

200779681 is an equidigital number, since it uses as much as digits as its factorization.

200779681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 200779681 is about 14169.6746963365. The cubic root of 200779681 is about 585.5624959574.

The spelling of 200779681 in words is "two hundred million, seven hundred seventy-nine thousand, six hundred eighty-one".