4581781 has 2 divisors, whose sum is σ = 4581782. Its totient is φ = 4581780.

The previous prime is 4581727. The next prime is 4581803. The reversal of 4581781 is 1871854.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3006756 + 1575025 = 1734^2 + 1255^2 .

It is a cyclic number.

It is not a de Polignac number, because 4581781 - 2¹¹ = 4579733 is a prime.

It is a super-2 number, since 2×4581781² = 41985434263922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4581281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2290890 + 2290891.

It is an arithmetic number, because the mean of its divisors is an integer number (2290891).

Almost surely, 2^4581781 is an apocalyptic number.

It is an amenable number.

4581781 is a deficient number, since it is larger than the sum of its proper divisors (1).

4581781 is an equidigital number, since it uses as much as digits as its factorization.

4581781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8960, while the sum is 34.

The square root of 4581781 is about 2140.5095187829. The cubic root of 4581781 is about 166.0904935537.

The spelling of 4581781 in words is "four million, five hundred eighty-one thousand, seven hundred eighty-one".