51221479 has 8 divisors (see below), whose sum is σ = 52348032. Its totient is φ = 50100960.

The previous prime is 51221441. The next prime is 51221491. The reversal of 51221479 is 97412215.

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

It is a cyclic number.

It is not a de Polignac number, because 51221479 - 2²³ = 42832871 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51221479.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51221419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18474 + ... + 21064.

It is an arithmetic number, because the mean of its divisors is an integer number (6543504).

Almost surely, 2^51221479 is an apocalyptic number.

51221479 is a deficient number, since it is larger than the sum of its proper divisors (1126553).

51221479 is a wasteful number, since it uses less digits than its factorization.

51221479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3017.

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

The square root of 51221479 is about 7156.9182613748. The cubic root of 51221479 is about 371.3790247872.

The spelling of 51221479 in words is "fifty-one million, two hundred twenty-one thousand, four hundred seventy-nine".