521406431171 has 2 divisors, whose sum is σ = 521406431172. Its totient is φ = 521406431170.

The previous prime is 521406431167. The next prime is 521406431177. The reversal of 521406431171 is 171134604125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521406431171 - 2² = 521406431167 is a prime.

It is not a weakly prime, because it can be changed into another prime (521406431177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260703215585 + 260703215586.

It is an arithmetic number, because the mean of its divisors is an integer number (260703215586).

Almost surely, 2^521406431171 is an apocalyptic number.

521406431171 is a deficient number, since it is larger than the sum of its proper divisors (1).

521406431171 is an equidigital number, since it uses as much as digits as its factorization.

521406431171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 521406431171 in words is "five hundred twenty-one billion, four hundred six million, four hundred thirty-one thousand, one hundred seventy-one".