51219481 has 8 divisors (see below), whose sum is σ = 53406720. Its totient is φ = 49060368.

The previous prime is 51219473. The next prime is 51219491. The reversal of 51219481 is 18491215.

It is a happy number.

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 51219481 - 2³ = 51219473 is a prime.

It is a super-2 number, since 2×51219481² = 5246870467818722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51219461) 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, 3271 + ... + 10636.

It is an arithmetic number, because the mean of its divisors is an integer number (6675840).

Almost surely, 2^51219481 is an apocalyptic number.

It is an amenable number.

51219481 is a deficient number, since it is larger than the sum of its proper divisors (2187239).

51219481 is a wasteful number, since it uses less digits than its factorization.

51219481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14063.

The product of its digits is 2880, while the sum is 31.

The square root of 51219481 is about 7156.7786747950. The cubic root of 51219481 is about 371.3741959214.

The spelling of 51219481 in words is "fifty-one million, two hundred nineteen thousand, four hundred eighty-one".