55135031521 has 2 divisors, whose sum is σ = 55135031522. Its totient is φ = 55135031520.

The previous prime is 55135031503. The next prime is 55135031527. The reversal of 55135031521 is 12513053155.

55135031521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46235750625 + 8899280896 = 215025^2 + 94336^2 .

It is a cyclic number.

It is not a de Polignac number, because 55135031521 - 2¹¹ = 55135029473 is a prime.

It is not a weakly prime, because it can be changed into another prime (55135031527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27567515760 + 27567515761.

It is an arithmetic number, because the mean of its divisors is an integer number (27567515761).

Almost surely, 2^55135031521 is an apocalyptic number.

It is an amenable number.

55135031521 is a deficient number, since it is larger than the sum of its proper divisors (1).

55135031521 is an equidigital number, since it uses as much as digits as its factorization.

55135031521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11250, while the sum is 31.

Adding to 55135031521 its reverse (12513053155), we get a palindrome (67648084676).

The spelling of 55135031521 in words is "fifty-five billion, one hundred thirty-five million, thirty-one thousand, five hundred twenty-one".