2070781 has 2 divisors, whose sum is σ = 2070782. Its totient is φ = 2070780.

The previous prime is 2070749. The next prime is 2070793. The reversal of 2070781 is 1870702.

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., 1276900 + 793881 = 1130^2 + 891^2 .

It is a cyclic number.

It is not a de Polignac number, because 2070781 - 2⁵ = 2070749 is a prime.

It is a super-2 number, since 2×2070781² = 8576267899922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2070181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1035390 + 1035391.

It is an arithmetic number, because the mean of its divisors is an integer number (1035391).

2^2070781 is an apocalyptic number.

It is an amenable number.

2070781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2070781 is an equidigital number, since it uses as much as digits as its factorization.

2070781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 2070781 is about 1439.0208476600. The cubic root of 2070781 is about 127.4612159364.

The spelling of 2070781 in words is "two million, seventy thousand, seven hundred eighty-one".