55148789 has 2 divisors, whose sum is σ = 55148790. Its totient is φ = 55148788.

The previous prime is 55148729. The next prime is 55148791. The reversal of 55148789 is 98784155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55011889 + 136900 = 7417^2 + 370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55148789 is a prime.

Together with 55148791, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55148729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27574394 + 27574395.

It is an arithmetic number, because the mean of its divisors is an integer number (27574395).

Almost surely, 2^55148789 is an apocalyptic number.

It is an amenable number.

55148789 is a deficient number, since it is larger than the sum of its proper divisors (1).

55148789 is an equidigital number, since it uses as much as digits as its factorization.

55148789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 403200, while the sum is 47.

The square root of 55148789 is about 7426.2230642501. The cubic root of 55148789 is about 380.6378691151.

The spelling of 55148789 in words is "fifty-five million, one hundred forty-eight thousand, seven hundred eighty-nine".