51124013 has 4 divisors (see below), whose sum is σ = 52886940. Its totient is φ = 49361088.

The previous prime is 51124001. The next prime is 51124037. The reversal of 51124013 is 31042115.

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 31214569 + 19909444 = 5587^2 + 4462^2 .

It is a cyclic number.

It is not a de Polignac number, because 51124013 - 2⁶ = 51123949 is a prime.

It is a super-2 number, since 2×51124013² = 5227329410448338, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51123982 and 51124000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51124043) 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, 881420 + ... + 881477.

It is an arithmetic number, because the mean of its divisors is an integer number (13221735).

Almost surely, 2^51124013 is an apocalyptic number.

It is an amenable number.

51124013 is a deficient number, since it is larger than the sum of its proper divisors (1762927).

51124013 is a wasteful number, since it uses less digits than its factorization.

51124013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762926.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 51124013 is about 7150.1058034130. The cubic root of 51124013 is about 371.1433176067.

Adding to 51124013 its reverse (31042115), we get a palindrome (82166128).

The spelling of 51124013 in words is "fifty-one million, one hundred twenty-four thousand, thirteen".