543700721 has 2 divisors, whose sum is σ = 543700722. Its totient is φ = 543700720.

The previous prime is 543700711. The next prime is 543700739. The reversal of 543700721 is 127007345.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 505755121 + 37945600 = 22489^2 + 6160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-543700721 is a prime.

It is a super-2 number, since 2×543700721² = 591220948031839682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (543700711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271850360 + 271850361.

It is an arithmetic number, because the mean of its divisors is an integer number (271850361).

Almost surely, 2^543700721 is an apocalyptic number.

It is an amenable number.

543700721 is a deficient number, since it is larger than the sum of its proper divisors (1).

543700721 is an equidigital number, since it uses as much as digits as its factorization.

543700721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 543700721 is about 23317.3909561083. The cubic root of 543700721 is about 816.1812927197.

The spelling of 543700721 in words is "five hundred forty-three million, seven hundred thousand, seven hundred twenty-one".