55136789 has 2 divisors, whose sum is σ = 55136790. Its totient is φ = 55136788.

The previous prime is 55136717. The next prime is 55136813. The reversal of 55136789 is 98763155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43692100 + 11444689 = 6610^2 + 3383^2 .

It is a cyclic number.

It is not a de Polignac number, because 55136789 - 2⁸ = 55136533 is a 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 (55136089) 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, 27568394 + 27568395.

It is an arithmetic number, because the mean of its divisors is an integer number (27568395).

Almost surely, 2^55136789 is an apocalyptic number.

It is an amenable number.

55136789 is a deficient number, since it is larger than the sum of its proper divisors (1).

55136789 is an equidigital number, since it uses as much as digits as its factorization.

55136789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 44.

The square root of 55136789 is about 7425.4150725734. The cubic root of 55136789 is about 380.6102590452.

The spelling of 55136789 in words is "fifty-five million, one hundred thirty-six thousand, seven hundred eighty-nine".