51540013 has 12 divisors (see below), whose sum is σ = 60279552. Its totient is φ = 43937880.

The previous prime is 51539977. The next prime is 51540023. The reversal of 51540013 is 31004515.

It is not a de Polignac number, because 51540013 - 2²⁵ = 17985581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51540023) 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 in 11 ways as a sum of consecutive naturals, for example, 6606 + ... + 12112.

It is an arithmetic number, because the mean of its divisors is an integer number (5023296).

Almost surely, 2^51540013 is an apocalyptic number.

It is an amenable number.

51540013 is a deficient number, since it is larger than the sum of its proper divisors (8739539).

51540013 is a wasteful number, since it uses less digits than its factorization.

51540013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5712 (or 5705 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 51540013 is about 7179.1373437203. The cubic root of 51540013 is about 372.1472732672.

Adding to 51540013 its reverse (31004515), we get a palindrome (82544528).

The spelling of 51540013 in words is "fifty-one million, five hundred forty thousand, thirteen".