521006081 has 2 divisors, whose sum is σ = 521006082. Its totient is φ = 521006080.

The previous prime is 521006071. The next prime is 521006093. The reversal of 521006081 is 180600125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 517335025 + 3671056 = 22745^2 + 1916^2 .

It is a cyclic number.

It is not a de Polignac number, because 521006081 - 2¹⁰ = 521005057 is a prime.

It is a super-2 number, since 2×521006081² = 542894672877957122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (521006041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260503040 + 260503041.

It is an arithmetic number, because the mean of its divisors is an integer number (260503041).

Almost surely, 2^521006081 is an apocalyptic number.

It is an amenable number.

521006081 is a deficient number, since it is larger than the sum of its proper divisors (1).

521006081 is an equidigital number, since it uses as much as digits as its factorization.

521006081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 521006081 is about 22825.5576273615. The cubic root of 521006081 is about 804.6634298925.

The spelling of 521006081 in words is "five hundred twenty-one million, six thousand, eighty-one".