51015013 has 4 divisors (see below), whose sum is σ = 58302880. Its totient is φ = 43727148.

The previous prime is 51015007. The next prime is 51015023. The reversal of 51015013 is 31051015.

51015013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31051015 = 5 ⋅6210203.

It is a cyclic number.

It is not a de Polignac number, because 51015013 - 2¹³ = 51006821 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 (51015023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3643923 + ... + 3643936.

It is an arithmetic number, because the mean of its divisors is an integer number (14575720).

Almost surely, 2^51015013 is an apocalyptic number.

It is an amenable number.

51015013 is a deficient number, since it is larger than the sum of its proper divisors (7287867).

51015013 is an equidigital number, since it uses as much as digits as its factorization.

51015013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7287866.

The product of its (nonzero) digits is 75, while the sum is 16.

The square root of 51015013 is about 7142.4794714441. The cubic root of 51015013 is about 370.8793620207.

Adding to 51015013 its reverse (31051015), we get a palindrome (82066028).

The spelling of 51015013 in words is "fifty-one million, fifteen thousand, thirteen".