51748013 has 4 divisors (see below), whose sum is σ = 52143168. Its totient is φ = 51352860.

The previous prime is 51748007. The next prime is 51748043. The reversal of 51748013 is 31084715.

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: 31084715 = 5 ⋅6216943.

It is a cyclic number.

It is not a de Polignac number, because 51748013 - 2¹⁸ = 51485869 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51748043) 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, 197381 + ... + 197642.

It is an arithmetic number, because the mean of its divisors is an integer number (13035792).

Almost surely, 2^51748013 is an apocalyptic number.

It is an amenable number.

51748013 is a deficient number, since it is larger than the sum of its proper divisors (395155).

51748013 is a wasteful number, since it uses less digits than its factorization.

51748013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395154.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 51748013 is about 7193.6091775965. The cubic root of 51748013 is about 372.6472261595.

The spelling of 51748013 in words is "fifty-one million, seven hundred forty-eight thousand, thirteen".