51717013 has 4 divisors (see below), whose sum is σ = 51738048. Its totient is φ = 51695980.

The previous prime is 51716969. The next prime is 51717023. The reversal of 51717013 is 31071715.

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.

It is a cyclic number.

It is not a de Polignac number, because 51717013 - 2¹³ = 51708821 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 (51717023) 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, 6253 + ... + 11938.

It is an arithmetic number, because the mean of its divisors is an integer number (12934512).

Almost surely, 2^51717013 is an apocalyptic number.

It is an amenable number.

51717013 is a deficient number, since it is larger than the sum of its proper divisors (21035).

51717013 is a wasteful number, since it uses less digits than its factorization.

51717013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21034.

The product of its (nonzero) digits is 735, while the sum is 25.

The square root of 51717013 is about 7191.4541644927. The cubic root of 51717013 is about 372.5727990083.

Adding to 51717013 its reverse (31071715), we get a palindrome (82788728).

The spelling of 51717013 in words is "fifty-one million, seven hundred seventeen thousand, thirteen".