51331219 has 4 divisors (see below), whose sum is σ = 51413200. Its totient is φ = 51249240.

The previous prime is 51331213. The next prime is 51331223. The reversal of 51331219 is 91213315.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51331219 - 2¹⁷ = 51200147 is a prime.

It is a super-2 number, since 2×51331219² = 5269788088051922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51331193 and 51331202.

It is not an unprimeable number, because it can be changed into a prime (51331213) 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, 40044 + ... + 41305.

It is an arithmetic number, because the mean of its divisors is an integer number (12853300).

Almost surely, 2^51331219 is an apocalyptic number.

51331219 is a deficient number, since it is larger than the sum of its proper divisors (81981).

51331219 is an equidigital number, since it uses as much as digits as its factorization.

51331219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81980.

The product of its digits is 810, while the sum is 25.

The square root of 51331219 is about 7164.5808670152. The cubic root of 51331219 is about 371.6440572446.

The spelling of 51331219 in words is "fifty-one million, three hundred thirty-one thousand, two hundred nineteen".