51217641 has 12 divisors (see below), whose sum is σ = 74043840. Its totient is φ = 34116120.

The previous prime is 51217637. The next prime is 51217667. The reversal of 51217641 is 14671215.

It is a happy number.

51217641 is a `hidden beast` number, since 5 + 1 + 2 + 17 + 641 = 666.

It is not a de Polignac number, because 51217641 - 2² = 51217637 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51217541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16956 + ... + 19746.

It is an arithmetic number, because the mean of its divisors is an integer number (6170320).

Almost surely, 2^51217641 is an apocalyptic number.

It is an amenable number.

51217641 is a deficient number, since it is larger than the sum of its proper divisors (22826199).

51217641 is a wasteful number, since it uses less digits than its factorization.

51217641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4836 (or 4833 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 51217641 is about 7156.6501241852. The cubic root of 51217641 is about 371.3697488068.

Adding to 51217641 its reverse (14671215), we get a palindrome (65888856).

The spelling of 51217641 in words is "fifty-one million, two hundred seventeen thousand, six hundred forty-one".