54139909 has 2 divisors, whose sum is σ = 54139910. Its totient is φ = 54139908.

The previous prime is 54139903. The next prime is 54139937. The reversal of 54139909 is 90993145.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37149025 + 16990884 = 6095^2 + 4122^2 .

It is a cyclic number.

It is not a de Polignac number, because 54139909 - 2¹³ = 54131717 is a prime.

It is a super-2 number, since 2×54139909² = 5862259493056562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54139903) 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, 27069954 + 27069955.

It is an arithmetic number, because the mean of its divisors is an integer number (27069955).

Almost surely, 2^54139909 is an apocalyptic number.

It is an amenable number.

54139909 is a deficient number, since it is larger than the sum of its proper divisors (1).

54139909 is an equidigital number, since it uses as much as digits as its factorization.

54139909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 54139909 is about 7357.9826719013. The cubic root of 54139909 is about 378.3024673317.

The spelling of 54139909 in words is "fifty-four million, one hundred thirty-nine thousand, nine hundred nine".