543391921 has 2 divisors, whose sum is σ = 543391922. Its totient is φ = 543391920.

The previous prime is 543391883. The next prime is 543391949. The reversal of 543391921 is 129193345.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 311134321 + 232257600 = 17639^2 + 15240^2 .

It is a cyclic number.

It is not a de Polignac number, because 543391921 - 2²⁷ = 409174193 is a prime.

It is not a weakly prime, because it can be changed into another prime (543391021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271695960 + 271695961.

It is an arithmetic number, because the mean of its divisors is an integer number (271695961).

Almost surely, 2^543391921 is an apocalyptic number.

It is an amenable number.

543391921 is a deficient number, since it is larger than the sum of its proper divisors (1).

543391921 is an equidigital number, since it uses as much as digits as its factorization.

543391921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 37.

The square root of 543391921 is about 23310.7683485551. The cubic root of 543391921 is about 816.0267441454.

The spelling of 543391921 in words is "five hundred forty-three million, three hundred ninety-one thousand, nine hundred twenty-one".