55521205231 has 2 divisors, whose sum is σ = 55521205232. Its totient is φ = 55521205230.

The previous prime is 55521205219. The next prime is 55521205247. The reversal of 55521205231 is 13250212555.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55521205231 - 2¹⁵ = 55521172463 is a prime.

It is a super-2 number, since 2×55521205231² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55521205193 and 55521205202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55521205211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27760602615 + 27760602616.

It is an arithmetic number, because the mean of its divisors is an integer number (27760602616).

Almost surely, 2^55521205231 is an apocalyptic number.

55521205231 is a deficient number, since it is larger than the sum of its proper divisors (1).

55521205231 is an equidigital number, since it uses as much as digits as its factorization.

55521205231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15000, while the sum is 31.

Adding to 55521205231 its reverse (13250212555), we get a palindrome (68771417786).

The spelling of 55521205231 in words is "fifty-five billion, five hundred twenty-one million, two hundred five thousand, two hundred thirty-one".