521064667 has 2 divisors, whose sum is σ = 521064668. Its totient is φ = 521064666.

The previous prime is 521064587. The next prime is 521064707. The reversal of 521064667 is 766460125.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 521064667 - 2¹⁹ = 520540379 is a prime.

It is equal to p_27405595 and since 521064667 and 27405595 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (521064967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260532333 + 260532334.

It is an arithmetic number, because the mean of its divisors is an integer number (260532334).

Almost surely, 2^521064667 is an apocalyptic number.

521064667 is a deficient number, since it is larger than the sum of its proper divisors (1).

521064667 is an equidigital number, since it uses as much as digits as its factorization.

521064667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 521064667 is about 22826.8409334275. The cubic root of 521064667 is about 804.6935896459.

It can be divided in two parts, 521064 and 667, that added together give a triangular number (521731 = T₁₀₂₁).

The spelling of 521064667 in words is "five hundred twenty-one million, sixty-four thousand, six hundred sixty-seven".