51172509 has 8 divisors (see below), whose sum is σ = 68263360. Its totient is φ = 34098336.

The previous prime is 51172483. The next prime is 51172531. The reversal of 51172509 is 90527115.

51172509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51172509 - 2⁵ = 51172477 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 (51172549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8457 + ... + 13185.

It is an arithmetic number, because the mean of its divisors is an integer number (8532920).

Almost surely, 2^51172509 is an apocalyptic number.

It is an amenable number.

51172509 is a deficient number, since it is larger than the sum of its proper divisors (17090851).

51172509 is a wasteful number, since it uses less digits than its factorization.

51172509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8339.

The product of its (nonzero) digits is 3150, while the sum is 30.

The square root of 51172509 is about 7153.4962780447. The cubic root of 51172509 is about 371.2606354581.

It can be divided in two parts, 51172 and 509, that added together give a triangular number (51681 = T₃₂₁).

The spelling of 51172509 in words is "fifty-one million, one hundred seventy-two thousand, five hundred nine".