51012013 has 8 divisors (see below), whose sum is σ = 55004600. Its totient is φ = 47029248.

The previous prime is 51012007. The next prime is 51012029. The reversal of 51012013 is 31021015.

It can be written as a sum of positive squares in 4 ways, for example, as 2319529 + 48692484 = 1523^2 + 6978^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51012013 - 2⁵ = 51011981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51011984 and 51012002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51012613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11173 + ... + 15061.

It is an arithmetic number, because the mean of its divisors is an integer number (6875575).

Almost surely, 2^51012013 is an apocalyptic number.

It is an amenable number.

51012013 is a deficient number, since it is larger than the sum of its proper divisors (3992587).

51012013 is a wasteful number, since it uses less digits than its factorization.

51012013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4911.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 51012013 is about 7142.2694572524. The cubic root of 51012013 is about 370.8720918740.

Adding to 51012013 its reverse (31021015), we get a palindrome (82033028).

The spelling of 51012013 in words is "fifty-one million, twelve thousand, thirteen".