55877609 has 2 divisors, whose sum is σ = 55877610. Its totient is φ = 55877608.

The previous prime is 55877599. The next prime is 55877611. The reversal of 55877609 is 90677855.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43296400 + 12581209 = 6580^2 + 3547^2 .

It is a cyclic number.

It is not a de Polignac number, because 55877609 - 2¹² = 55873513 is a prime.

It is a Sophie Germain prime.

Together with 55877611, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (55877009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27938804 + 27938805.

It is an arithmetic number, because the mean of its divisors is an integer number (27938805).

Almost surely, 2^55877609 is an apocalyptic number.

It is an amenable number.

55877609 is a deficient number, since it is larger than the sum of its proper divisors (1).

55877609 is an equidigital number, since it uses as much as digits as its factorization.

55877609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 529200, while the sum is 47.

The square root of 55877609 is about 7475.1327078521. The cubic root of 55877609 is about 382.3073123492.

The spelling of 55877609 in words is "fifty-five million, eight hundred seventy-seven thousand, six hundred nine".