521561832149 has 2 divisors, whose sum is σ = 521561832150. Its totient is φ = 521561832148.

The previous prime is 521561832139. The next prime is 521561832157. The reversal of 521561832149 is 941238165125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 519768902500 + 1792929649 = 720950^2 + 42343^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521561832149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521561832139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260780916074 + 260780916075.

It is an arithmetic number, because the mean of its divisors is an integer number (260780916075).

Almost surely, 2^521561832149 is an apocalyptic number.

It is an amenable number.

521561832149 is a deficient number, since it is larger than the sum of its proper divisors (1).

521561832149 is an equidigital number, since it uses as much as digits as its factorization.

521561832149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 47.

The spelling of 521561832149 in words is "five hundred twenty-one billion, five hundred sixty-one million, eight hundred thirty-two thousand, one hundred forty-nine".