2985781 has 2 divisors, whose sum is σ = 2985782. Its totient is φ = 2985780.

The previous prime is 2985751. The next prime is 2985809. The reversal of 2985781 is 1875892.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2588881 + 396900 = 1609^2 + 630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2985781 is a prime.

It is a super-2 number, since 2×2985781² = 17829776359922, which contains 22 as substring.

2985781 is a lucky number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2985701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1492890 + 1492891.

It is an arithmetic number, because the mean of its divisors is an integer number (1492891).

2^2985781 is an apocalyptic number.

It is an amenable number.

2985781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2985781 is an equidigital number, since it uses as much as digits as its factorization.

2985781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 40.

The square root of 2985781 is about 1727.9412605757. The cubic root of 2985781 is about 143.9967366802.

The spelling of 2985781 in words is "two million, nine hundred eighty-five thousand, seven hundred eighty-one".