54749509 has 2 divisors, whose sum is σ = 54749510. Its totient is φ = 54749508.

The previous prime is 54749491. The next prime is 54749533. The reversal of 54749509 is 90594745.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28196100 + 26553409 = 5310^2 + 5153^2 .

It is a cyclic number.

It is not a de Polignac number, because 54749509 - 2⁹ = 54748997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54749599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27374754 + 27374755.

It is an arithmetic number, because the mean of its divisors is an integer number (27374755).

Almost surely, 2^54749509 is an apocalyptic number.

It is an amenable number.

54749509 is a deficient number, since it is larger than the sum of its proper divisors (1).

54749509 is an equidigital number, since it uses as much as digits as its factorization.

54749509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 54749509 is about 7399.2911146947. The cubic root of 54749509 is about 379.7170307966.

The spelling of 54749509 in words is "fifty-four million, seven hundred forty-nine thousand, five hundred nine".