51695172 has 30 divisors (see below), whose sum is σ = 135142238. Its totient is φ = 17231616.

The previous prime is 51695167. The next prime is 51695173. The reversal of 51695172 is 27159615.

It can be written as a sum of positive squares in only one way, i.e., 46049796 + 5645376 = 6786^2 + 2376^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (51695173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 79453 + ... + 80100.

Almost surely, 2^51695172 is an apocalyptic number.

It is an amenable number.

51695172 is an abundant number, since it is smaller than the sum of its proper divisors (83447066).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51695172 is a wasteful number, since it uses less digits than its factorization.

51695172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159569 (or 159558 counting only the distinct ones).

The product of its digits is 18900, while the sum is 36.

The square root of 51695172 is about 7189.9354656353. The cubic root of 51695172 is about 372.5203436182.

The spelling of 51695172 in words is "fifty-one million, six hundred ninety-five thousand, one hundred seventy-two".