55120531 has 2 divisors, whose sum is σ = 55120532. Its totient is φ = 55120530.

The previous prime is 55120469. The next prime is 55120543. The reversal of 55120531 is 13502155.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55120531 - 2¹⁵ = 55087763 is a prime.

It is a super-2 number, since 2×55120531² = 6076545875443922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55120631) 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, 27560265 + 27560266.

It is an arithmetic number, because the mean of its divisors is an integer number (27560266).

Almost surely, 2^55120531 is an apocalyptic number.

55120531 is a deficient number, since it is larger than the sum of its proper divisors (1).

55120531 is an equidigital number, since it uses as much as digits as its factorization.

55120531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 55120531 is about 7424.3202382440. The cubic root of 55120531 is about 380.5728456109.

Adding to 55120531 its reverse (13502155), we get a palindrome (68622686).

The spelling of 55120531 in words is "fifty-five million, one hundred twenty thousand, five hundred thirty-one".