51172870 has 16 divisors (see below), whose sum is σ = 105270048. Its totient is φ = 17544960.

The previous prime is 51172829. The next prime is 51172897. The reversal of 51172870 is 7827115.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 365451 + ... + 365590.

It is an arithmetic number, because the mean of its divisors is an integer number (6579378).

Almost surely, 2^51172870 is an apocalyptic number.

51172870 is an abundant number, since it is smaller than the sum of its proper divisors (54097178).

51172870 is a wasteful number, since it uses less digits than its factorization.

51172870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731055.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 51172870 is about 7153.5215104171. The cubic root of 51172870 is about 371.2615084840.

Adding to 51172870 its reverse (7827115), we get a palindrome (58999985).

The spelling of 51172870 in words is "fifty-one million, one hundred seventy-two thousand, eight hundred seventy".