544140721 has 2 divisors, whose sum is σ = 544140722. Its totient is φ = 544140720.

The previous prime is 544140713. The next prime is 544140787. The reversal of 544140721 is 127041445.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 301404321 + 242736400 = 17361^2 + 15580^2 .

It is a cyclic number.

It is not a de Polignac number, because 544140721 - 2³ = 544140713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 544140721.

It is not a weakly prime, because it can be changed into another prime (544120721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272070360 + 272070361.

It is an arithmetic number, because the mean of its divisors is an integer number (272070361).

Almost surely, 2^544140721 is an apocalyptic number.

It is an amenable number.

544140721 is a deficient number, since it is larger than the sum of its proper divisors (1).

544140721 is an equidigital number, since it uses as much as digits as its factorization.

544140721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 544140721 is about 23326.8240658689. The cubic root of 544140721 is about 816.4014033576.

The spelling of 544140721 in words is "five hundred forty-four million, one hundred forty thousand, seven hundred twenty-one".