55206531 has 12 divisors (see below), whose sum is σ = 84433752. Its totient is φ = 34639296.

The previous prime is 55206527. The next prime is 55206551. The reversal of 55206531 is 13560255.

55206531 is a `hidden beast` number, since 5 + 5 + 2 + 0 + 653 + 1 = 666.

It is not a de Polignac number, because 55206531 - 2² = 55206527 is a prime.

It is a super-2 number, since 2×55206531² = 6095522130107922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55206495 and 55206504.

It is not an unprimeable number, because it can be changed into a prime (55206551) 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 in 11 ways as a sum of consecutive naturals, for example, 180261 + ... + 180566.

It is an arithmetic number, because the mean of its divisors is an integer number (7036146).

Almost surely, 2^55206531 is an apocalyptic number.

55206531 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

55206531 is a deficient number, since it is larger than the sum of its proper divisors (29227221).

55206531 is a wasteful number, since it uses less digits than its factorization.

55206531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360850 (or 360847 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 55206531 is about 7430.1097569282. The cubic root of 55206531 is about 380.7706681964.

Adding to 55206531 its reverse (13560255), we get a palindrome (68766786).

The spelling of 55206531 in words is "fifty-five million, two hundred six thousand, five hundred thirty-one".