523640081 has 2 divisors, whose sum is σ = 523640082. Its totient is φ = 523640080.

The previous prime is 523640027. The next prime is 523640093. The reversal of 523640081 is 180046325.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 398401600 + 125238481 = 19960^2 + 11191^2 .

It is a cyclic number.

It is not a de Polignac number, because 523640081 - 2¹⁰ = 523639057 is a prime.

It is a super-2 number, since 2×523640081² = 548397868859373122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (523640881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261820040 + 261820041.

It is an arithmetic number, because the mean of its divisors is an integer number (261820041).

Almost surely, 2^523640081 is an apocalyptic number.

It is an amenable number.

523640081 is a deficient number, since it is larger than the sum of its proper divisors (1).

523640081 is an equidigital number, since it uses as much as digits as its factorization.

523640081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 523640081 is about 22883.1833668308. The cubic root of 523640081 is about 806.0171707885.

The spelling of 523640081 in words is "five hundred twenty-three million, six hundred forty thousand, eighty-one".