54891509 has 2 divisors, whose sum is σ = 54891510. Its totient is φ = 54891508.

The previous prime is 54891493. The next prime is 54891511. The reversal of 54891509 is 90519845.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42289009 + 12602500 = 6503^2 + 3550^2 .

It is a cyclic number.

It is not a de Polignac number, because 54891509 - 2⁴ = 54891493 is a prime.

Together with 54891511, 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 (54891569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27445754 + 27445755.

It is an arithmetic number, because the mean of its divisors is an integer number (27445755).

Almost surely, 2^54891509 is an apocalyptic number.

It is an amenable number.

54891509 is a deficient number, since it is larger than the sum of its proper divisors (1).

54891509 is an equidigital number, since it uses as much as digits as its factorization.

54891509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 54891509 is about 7408.8804147455. The cubic root of 54891509 is about 380.0450292899.

The spelling of 54891509 in words is "fifty-four million, eight hundred ninety-one thousand, five hundred nine".