55549961 has 2 divisors, whose sum is σ = 55549962. Its totient is φ = 55549960.

The previous prime is 55549951. The next prime is 55549979. The reversal of 55549961 is 16994555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50055625 + 5494336 = 7075^2 + 2344^2 .

It is a cyclic number.

It is not a de Polignac number, because 55549961 - 2¹⁰ = 55548937 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55549951) 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, 27774980 + 27774981.

It is an arithmetic number, because the mean of its divisors is an integer number (27774981).

Almost surely, 2^55549961 is an apocalyptic number.

It is an amenable number.

55549961 is a deficient number, since it is larger than the sum of its proper divisors (1).

55549961 is an equidigital number, since it uses as much as digits as its factorization.

55549961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 243000, while the sum is 44.

The square root of 55549961 is about 7453.1846213548. The cubic root of 55549961 is about 381.5586054196.

The spelling of 55549961 in words is "fifty-five million, five hundred forty-nine thousand, nine hundred sixty-one".