55220531 has 2 divisors, whose sum is σ = 55220532. Its totient is φ = 55220530.

The previous prime is 55220527. The next prime is 55220551. The reversal of 55220531 is 13502255.

55220531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55220531 - 2² = 55220527 is a prime.

It is a super-2 number, since 2×55220531² = 6098614087843922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 55220497 and 55220506.

It is not a weakly prime, because it can be changed into another prime (55220521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27610265 + 27610266.

It is an arithmetic number, because the mean of its divisors is an integer number (27610266).

Almost surely, 2^55220531 is an apocalyptic number.

55220531 is a deficient number, since it is larger than the sum of its proper divisors (1).

55220531 is an equidigital number, since it uses as much as digits as its factorization.

55220531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 55220531 is about 7431.0518098046. The cubic root of 55220531 is about 380.8028524248.

Adding to 55220531 its reverse (13502255), we get a palindrome (68722786).

The spelling of 55220531 in words is "fifty-five million, two hundred twenty thousand, five hundred thirty-one".