55136639 has 2 divisors, whose sum is σ = 55136640. Its totient is φ = 55136638.

The previous prime is 55136597. The next prime is 55136647. The reversal of 55136639 is 93663155.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55136639 - 2¹⁶ = 55071103 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55136659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27568319 + 27568320.

It is an arithmetic number, because the mean of its divisors is an integer number (27568320).

Almost surely, 2^55136639 is an apocalyptic number.

55136639 is a deficient number, since it is larger than the sum of its proper divisors (1).

55136639 is an equidigital number, since it uses as much as digits as its factorization.

55136639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72900, while the sum is 38.

The square root of 55136639 is about 7425.4049721210. The cubic root of 55136639 is about 380.6099138940.

The spelling of 55136639 in words is "fifty-five million, one hundred thirty-six thousand, six hundred thirty-nine".