4536781 has 2 divisors, whose sum is σ = 4536782. Its totient is φ = 4536780.

The previous prime is 4536767. The next prime is 4536793. The reversal of 4536781 is 1876354.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4452100 + 84681 = 2110^2 + 291^2 .

It is a cyclic number.

It is not a de Polignac number, because 4536781 - 2¹⁵ = 4504013 is a prime.

It is a super-2 number, since 2×4536781² = 41164763683922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4536761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2268390 + 2268391.

It is an arithmetic number, because the mean of its divisors is an integer number (2268391).

Almost surely, 2^4536781 is an apocalyptic number.

It is an amenable number.

4536781 is a deficient number, since it is larger than the sum of its proper divisors (1).

4536781 is an equidigital number, since it uses as much as digits as its factorization.

4536781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 34.

The square root of 4536781 is about 2129.9720655445. The cubic root of 4536781 is about 165.5449505658.

The spelling of 4536781 in words is "four million, five hundred thirty-six thousand, seven hundred eighty-one".