55116521 has 2 divisors, whose sum is σ = 55116522. Its totient is φ = 55116520.

The previous prime is 55116493. The next prime is 55116527. The reversal of 55116521 is 12561155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54922921 + 193600 = 7411^2 + 440^2 .

It is a cyclic number.

It is not a de Polignac number, because 55116521 - 2¹⁸ = 54854377 is a prime.

It is not a weakly prime, because it can be changed into another prime (55116527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27558260 + 27558261.

It is an arithmetic number, because the mean of its divisors is an integer number (27558261).

Almost surely, 2^55116521 is an apocalyptic number.

It is an amenable number.

55116521 is a deficient number, since it is larger than the sum of its proper divisors (1).

55116521 is an equidigital number, since it uses as much as digits as its factorization.

55116521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1500, while the sum is 26.

The square root of 55116521 is about 7424.0501749382. The cubic root of 55116521 is about 380.5636165384.

Adding to 55116521 its reverse (12561155), we get a palindrome (67677676).

The spelling of 55116521 in words is "fifty-five million, one hundred sixteen thousand, five hundred twenty-one".