54111509 has 2 divisors, whose sum is σ = 54111510. Its totient is φ = 54111508.

The previous prime is 54111503. The next prime is 54111511. The reversal of 54111509 is 90511145.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51480625 + 2630884 = 7175^2 + 1622^2 .

It is a cyclic number.

It is not a de Polignac number, because 54111509 - 2²⁴ = 37334293 is a prime.

Together with 54111511, 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 (54111503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27055754 + 27055755.

It is an arithmetic number, because the mean of its divisors is an integer number (27055755).

Almost surely, 2^54111509 is an apocalyptic number.

It is an amenable number.

54111509 is a deficient number, since it is larger than the sum of its proper divisors (1).

54111509 is an equidigital number, since it uses as much as digits as its factorization.

54111509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 54111509 is about 7356.0525419548. The cubic root of 54111509 is about 378.2363074542.

The spelling of 54111509 in words is "fifty-four million, one hundred eleven thousand, five hundred nine".