4053781 has 2 divisors, whose sum is σ = 4053782. Its totient is φ = 4053780.

The previous prime is 4053779. The next prime is 4053787. The reversal of 4053781 is 1873504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2592100 + 1461681 = 1610^2 + 1209^2 .

It is a cyclic number.

It is not a de Polignac number, because 4053781 - 2¹ = 4053779 is a prime.

It is a super-2 number, since 2×4053781² = 32866280791922, which contains 22 as substring.

Together with 4053779, it forms a pair of twin primes.

It is an Ulam number.

4053781 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4053787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2026890 + 2026891.

It is an arithmetic number, because the mean of its divisors is an integer number (2026891).

Almost surely, 2^4053781 is an apocalyptic number.

It is an amenable number.

4053781 is a deficient number, since it is larger than the sum of its proper divisors (1).

4053781 is an equidigital number, since it uses as much as digits as its factorization.

4053781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 4053781 is about 2013.4003576040. The cubic root of 4053781 is about 159.4483738015.

It can be divided in two parts, 405 and 3781, that added together give a triangular number (4186 = T₉₁).

The spelling of 4053781 in words is "four million, fifty-three thousand, seven hundred eighty-one".