521140104061 has 2 divisors, whose sum is σ = 521140104062. Its totient is φ = 521140104060.

The previous prime is 521140104053. The next prime is 521140104073. The reversal of 521140104061 is 160401041125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 515209563961 + 5930540100 = 717781^2 + 77010^2 .

It is a cyclic number.

It is not a de Polignac number, because 521140104061 - 2³ = 521140104053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521140104091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260570052030 + 260570052031.

It is an arithmetic number, because the mean of its divisors is an integer number (260570052031).

Almost surely, 2^521140104061 is an apocalyptic number.

It is an amenable number.

521140104061 is a deficient number, since it is larger than the sum of its proper divisors (1).

521140104061 is an equidigital number, since it uses as much as digits as its factorization.

521140104061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 521140104061 its reverse (160401041125), we get a palindrome (681541145186).

The spelling of 521140104061 in words is "five hundred twenty-one billion, one hundred forty million, one hundred four thousand, sixty-one".