51219478 has 8 divisors (see below), whose sum is σ = 80872920. Its totient is φ = 24261840.

The previous prime is 51219473. The next prime is 51219491. The reversal of 51219478 is 87491215.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51219473) 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, 673903 + ... + 673978.

It is an arithmetic number, because the mean of its divisors is an integer number (10109115).

Almost surely, 2^51219478 is an apocalyptic number.

51219478 is a deficient number, since it is larger than the sum of its proper divisors (29653442).

51219478 is a wasteful number, since it uses less digits than its factorization.

51219478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347902.

The product of its digits is 20160, while the sum is 37.

The square root of 51219478 is about 7156.7784652035. The cubic root of 51219478 is about 371.3741886708.

The spelling of 51219478 in words is "fifty-one million, two hundred nineteen thousand, four hundred seventy-eight".