540262406521 has 2 divisors, whose sum is σ = 540262406522. Its totient is φ = 540262406520.

The previous prime is 540262406449. The next prime is 540262406533. The reversal of 540262406521 is 125604262045.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 519789089296 + 20473317225 = 720964^2 + 143085^2 .

It is a cyclic number.

It is not a de Polignac number, because 540262406521 - 2⁹ = 540262406009 is a prime.

It is not a weakly prime, because it can be changed into another prime (540262406581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 270131203260 + 270131203261.

It is an arithmetic number, because the mean of its divisors is an integer number (270131203261).

Almost surely, 2^540262406521 is an apocalyptic number.

It is an amenable number.

540262406521 is a deficient number, since it is larger than the sum of its proper divisors (1).

540262406521 is an equidigital number, since it uses as much as digits as its factorization.

540262406521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 115200, while the sum is 37.

Adding to 540262406521 its reverse (125604262045), we get a palindrome (665866668566).

The spelling of 540262406521 in words is "five hundred forty billion, two hundred sixty-two million, four hundred six thousand, five hundred twenty-one".