4078561 has 2 divisors, whose sum is σ = 4078562. Its totient is φ = 4078560.

The previous prime is 4078523. The next prime is 4078573. The reversal of 4078561 is 1658704.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2954961 + 1123600 = 1719^2 + 1060^2 .

It is a cyclic number.

It is not a de Polignac number, because 4078561 - 2²¹ = 1981409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4078511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2039280 + 2039281.

It is an arithmetic number, because the mean of its divisors is an integer number (2039281).

Almost surely, 2^4078561 is an apocalyptic number.

It is an amenable number.

4078561 is a deficient number, since it is larger than the sum of its proper divisors (1).

4078561 is an equidigital number, since it uses as much as digits as its factorization.

4078561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 4078561 is about 2019.5447506802. The cubic root of 4078561 is about 159.7726066673.

The spelling of 4078561 in words is "four million, seventy-eight thousand, five hundred sixty-one".