54195509 has 2 divisors, whose sum is σ = 54195510. Its totient is φ = 54195508.

The previous prime is 54195503. The next prime is 54195527. The reversal of 54195509 is 90559145.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51122500 + 3073009 = 7150^2 + 1753^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54195509 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54195503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27097754 + 27097755.

It is an arithmetic number, because the mean of its divisors is an integer number (27097755).

Almost surely, 2^54195509 is an apocalyptic number.

It is an amenable number.

54195509 is a deficient number, since it is larger than the sum of its proper divisors (1).

54195509 is an equidigital number, since it uses as much as digits as its factorization.

54195509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40500, while the sum is 38.

The square root of 54195509 is about 7361.7599118689. The cubic root of 54195509 is about 378.4319246420.

The spelling of 54195509 in words is "fifty-four million, one hundred ninety-five thousand, five hundred nine".