51721266 has 8 divisors (see below), whose sum is σ = 103442544. Its totient is φ = 17240420.

The previous prime is 51721261. The next prime is 51721309. The reversal of 51721266 is 66212715.

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

51721266 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (51721261) 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 3 ways as a sum of consecutive naturals, for example, 4310100 + ... + 4310111.

It is an arithmetic number, because the mean of its divisors is an integer number (12930318).

Almost surely, 2^51721266 is an apocalyptic number.

51721266 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51721266 is a wasteful number, since it uses less digits than its factorization.

51721266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8620216.

The product of its digits is 5040, while the sum is 30.

The square root of 51721266 is about 7191.7498566065. The cubic root of 51721266 is about 372.5830116933.

It can be divided in two parts, 5 and 1721266, that added together give a palindrome (1721271).

The spelling of 51721266 in words is "fifty-one million, seven hundred twenty-one thousand, two hundred sixty-six".