521406431167 has 2 divisors, whose sum is σ = 521406431168. Its totient is φ = 521406431166.

The previous prime is 521406431099. The next prime is 521406431171. The reversal of 521406431167 is 761134604125.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 521406431167 - 2²³ = 521398042559 is a prime.

It is a congruent number.

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, 260703215583 + 260703215584.

It is an arithmetic number, because the mean of its divisors is an integer number (260703215584).

Almost surely, 2^521406431167 is an apocalyptic number.

521406431167 is a deficient number, since it is larger than the sum of its proper divisors (1).

521406431167 is an equidigital number, since it uses as much as digits as its factorization.

521406431167 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 521406431167 in words is "five hundred twenty-one billion, four hundred six million, four hundred thirty-one thousand, one hundred sixty-seven".