55239161 has 2 divisors, whose sum is σ = 55239162. Its totient is φ = 55239160.

The previous prime is 55239143. The next prime is 55239203. The reversal of 55239161 is 16193255.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36481600 + 18757561 = 6040^2 + 4331^2 .

It is a cyclic number.

It is not a de Polignac number, because 55239161 - 2⁶ = 55239097 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_3295670 and since 55239161 and 3295670 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (55239101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27619580 + 27619581.

It is an arithmetic number, because the mean of its divisors is an integer number (27619581).

Almost surely, 2^55239161 is an apocalyptic number.

It is an amenable number.

55239161 is a deficient number, since it is larger than the sum of its proper divisors (1).

55239161 is an equidigital number, since it uses as much as digits as its factorization.

55239161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100, while the sum is 32.

The square root of 55239161 is about 7432.3052278549. The cubic root of 55239161 is about 380.8456720026.

The spelling of 55239161 in words is "fifty-five million, two hundred thirty-nine thousand, one hundred sixty-one".