54136513 has 4 divisors (see below), whose sum is σ = 55599700. Its totient is φ = 52673328.

The previous prime is 54136507. The next prime is 54136541. The reversal of 54136513 is 31563145.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45064369 + 9072144 = 6713^2 + 3012^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54136513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54136213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 731538 + ... + 731611.

It is an arithmetic number, because the mean of its divisors is an integer number (13899925).

Almost surely, 2^54136513 is an apocalyptic number.

It is an amenable number.

54136513 is a deficient number, since it is larger than the sum of its proper divisors (1463187).

54136513 is a wasteful number, since it uses less digits than its factorization.

54136513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1463186.

The product of its digits is 5400, while the sum is 28.

The square root of 54136513 is about 7357.7518985081. The cubic root of 54136513 is about 378.2945573193.

Adding to 54136513 its reverse (31563145), we get a palindrome (85699658).

The spelling of 54136513 in words is "fifty-four million, one hundred thirty-six thousand, five hundred thirteen".