2063781 has 6 divisors (see below), whose sum is σ = 2981030. Its totient is φ = 1375848.

The previous prime is 2063779. The next prime is 2063797. The reversal of 2063781 is 1873602.

2063781 is a `hidden beast` number, since 20 + 637 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1083681 + 980100 = 1041^2 + 990^2 .

It is not a de Polignac number, because 2063781 - 2¹ = 2063779 is a prime.

It is a super-2 number, since 2×2063781² = 8518384031922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2063731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 114646 + ... + 114663.

2^2063781 is an apocalyptic number.

It is an amenable number.

2063781 is a deficient number, since it is larger than the sum of its proper divisors (917249).

2063781 is a wasteful number, since it uses less digits than its factorization.

2063781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229315 (or 229312 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 2063781 is about 1436.5865793610. The cubic root of 2063781 is about 127.3174318992.

The spelling of 2063781 in words is "two million, sixty-three thousand, seven hundred eighty-one".