540583721 has 2 divisors, whose sum is σ = 540583722. Its totient is φ = 540583720.

The previous prime is 540583717. The next prime is 540583739. The reversal of 540583721 is 127385045.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 504451600 + 36132121 = 22460^2 + 6011^2 .

It is a cyclic number.

It is not a de Polignac number, because 540583721 - 2² = 540583717 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (540583711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 270291860 + 270291861.

It is an arithmetic number, because the mean of its divisors is an integer number (270291861).

Almost surely, 2^540583721 is an apocalyptic number.

It is an amenable number.

540583721 is a deficient number, since it is larger than the sum of its proper divisors (1).

540583721 is an equidigital number, since it uses as much as digits as its factorization.

540583721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 540583721 is about 23250.4563611126. The cubic root of 540583721 is about 814.6185983103.

The spelling of 540583721 in words is "five hundred forty million, five hundred eighty-three thousand, seven hundred twenty-one".