521113257461 has 2 divisors, whose sum is σ = 521113257462. Its totient is φ = 521113257460.

The previous prime is 521113257433. The next prime is 521113257463. The reversal of 521113257461 is 164752311125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 519724204561 + 1389052900 = 720919^2 + 37270^2 .

It is a cyclic number.

It is not a de Polignac number, because 521113257461 - 2¹⁸ = 521112995317 is a prime.

It is a super-2 number, since 2×521113257461² (a number of 24 digits) contains 22 as substring.

Together with 521113257463, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521113257463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260556628730 + 260556628731.

It is an arithmetic number, because the mean of its divisors is an integer number (260556628731).

Almost surely, 2^521113257461 is an apocalyptic number.

It is an amenable number.

521113257461 is a deficient number, since it is larger than the sum of its proper divisors (1).

521113257461 is an equidigital number, since it uses as much as digits as its factorization.

521113257461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 38.

Adding to 521113257461 its reverse (164752311125), we get a palindrome (685865568586).

The spelling of 521113257461 in words is "five hundred twenty-one billion, one hundred thirteen million, two hundred fifty-seven thousand, four hundred sixty-one".