55127509 has 2 divisors, whose sum is σ = 55127510. Its totient is φ = 55127508.

The previous prime is 55127507. The next prime is 55127519. The reversal of 55127509 is 90572155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54066609 + 1060900 = 7353^2 + 1030^2 .

It is a cyclic number.

It is not a de Polignac number, because 55127509 - 2¹ = 55127507 is a prime.

Together with 55127507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55127503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27563754 + 27563755.

It is an arithmetic number, because the mean of its divisors is an integer number (27563755).

Almost surely, 2^55127509 is an apocalyptic number.

It is an amenable number.

55127509 is a deficient number, since it is larger than the sum of its proper divisors (1).

55127509 is an equidigital number, since it uses as much as digits as its factorization.

55127509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15750, while the sum is 34.

The square root of 55127509 is about 7424.7901653851. The cubic root of 55127509 is about 380.5889045107.

The spelling of 55127509 in words is "fifty-five million, one hundred twenty-seven thousand, five hundred nine".