51421279 has 8 divisors (see below), whose sum is σ = 63287840. Its totient is φ = 40684896.

The previous prime is 51421259. The next prime is 51421283. The reversal of 51421279 is 97212415.

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

It is a de Polignac number, because none of the positive numbers 2^k-51421279 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51421279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51421229) 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 7 ways as a sum of consecutive naturals, for example, 282444 + ... + 282625.

It is an arithmetic number, because the mean of its divisors is an integer number (7910980).

Almost surely, 2^51421279 is an apocalyptic number.

51421279 is a deficient number, since it is larger than the sum of its proper divisors (11866561).

51421279 is a wasteful number, since it uses less digits than its factorization.

51421279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565089.

The product of its digits is 5040, while the sum is 31.

The square root of 51421279 is about 7170.8631976911. The cubic root of 51421279 is about 371.8612785842.

The spelling of 51421279 in words is "fifty-one million, four hundred twenty-one thousand, two hundred seventy-nine".