51810172 has 24 divisors (see below), whose sum is σ = 92106000. Its totient is φ = 25497600.

The previous prime is 51810151. The next prime is 51810173. The reversal of 51810172 is 27101815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51810173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103579 + ... + 104077.

It is an arithmetic number, because the mean of its divisors is an integer number (3837750).

Almost surely, 2^51810172 is an apocalyptic number.

It is an amenable number.

51810172 is a deficient number, since it is larger than the sum of its proper divisors (40295828).

51810172 is a wasteful number, since it uses less digits than its factorization.

51810172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861 (or 859 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 51810172 is about 7197.9283130634. The cubic root of 51810172 is about 372.7963726952.

Adding to 51810172 its reverse (27101815), we get a palindrome (78911987).

The spelling of 51810172 in words is "fifty-one million, eight hundred ten thousand, one hundred seventy-two".