51145013 has 4 divisors (see below), whose sum is σ = 51159360. Its totient is φ = 51130668.

The previous prime is 51145001. The next prime is 51145021. The reversal of 51145013 is 31054115.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51145013 - 2¹⁶ = 51079477 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 (51145033) 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, 2756 + ... + 10482.

It is an arithmetic number, because the mean of its divisors is an integer number (12789840).

Almost surely, 2^51145013 is an apocalyptic number.

It is an amenable number.

51145013 is a deficient number, since it is larger than the sum of its proper divisors (14347).

51145013 is an equidigital number, since it uses as much as digits as its factorization.

51145013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14346.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 51145013 is about 7151.5741623785. The cubic root of 51145013 is about 371.1941283203.

Adding to 51145013 its reverse (31054115), we get a palindrome (82199128).

The spelling of 51145013 in words is "fifty-one million, one hundred forty-five thousand, thirteen".