521520107 has 2 divisors, whose sum is σ = 521520108. Its totient is φ = 521520106.

The previous prime is 521520089. The next prime is 521520127. The reversal of 521520107 is 701025125.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521520107 - 2¹⁰ = 521519083 is a prime.

It is not a weakly prime, because it can be changed into another prime (521520127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260760053 + 260760054.

It is an arithmetic number, because the mean of its divisors is an integer number (260760054).

Almost surely, 2^521520107 is an apocalyptic number.

521520107 is a deficient number, since it is larger than the sum of its proper divisors (1).

521520107 is an equidigital number, since it uses as much as digits as its factorization.

521520107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 521520107 is about 22836.8147297297. The cubic root of 521520107 is about 804.9279706137.

The spelling of 521520107 in words is "five hundred twenty-one million, five hundred twenty thousand, one hundred seven".