2000715781 has 2 divisors, whose sum is σ = 2000715782. Its totient is φ = 2000715780.

The previous prime is 2000715679. The next prime is 2000715791. The reversal of 2000715781 is 1875170002.

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., 1626912225 + 373803556 = 40335^2 + 19334^2 .

It is a cyclic number.

It is not a de Polignac number, because 2000715781 - 2¹⁹ = 2000191493 is a prime.

It is a super-2 number, since 2×2000715781² = 8005727272684879922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2000715791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000357890 + 1000357891.

It is an arithmetic number, because the mean of its divisors is an integer number (1000357891).

Almost surely, 2^2000715781 is an apocalyptic number.

It is an amenable number.

2000715781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2000715781 is an equidigital number, since it uses as much as digits as its factorization.

2000715781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 2000715781 is about 44729.3615089686. The cubic root of 2000715781 is about 1260.0713365591.

Adding to 2000715781 its reverse (1875170002), we get a palindrome (3875885783).

The spelling of 2000715781 in words is "two billion, seven hundred fifteen thousand, seven hundred eighty-one".