51172887 has 8 divisors (see below), whose sum is σ = 70074736. Its totient is φ = 33193152.

The previous prime is 51172829. The next prime is 51172897. The reversal of 51172887 is 78827115.

51172887 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 51172887 - 2¹⁴ = 51156503 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 (51172817) 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, 230398 + ... + 230619.

It is an arithmetic number, because the mean of its divisors is an integer number (8759342).

Almost surely, 2^51172887 is an apocalyptic number.

51172887 is a deficient number, since it is larger than the sum of its proper divisors (18901849).

51172887 is a wasteful number, since it uses less digits than its factorization.

51172887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461057.

The product of its digits is 31360, while the sum is 39.

The square root of 51172887 is about 7153.5226986430. The cubic root of 51172887 is about 371.2615495959.

The spelling of 51172887 in words is "fifty-one million, one hundred seventy-two thousand, eight hundred eighty-seven".