51278315 has 8 divisors (see below), whose sum is σ = 67128048. Its totient is φ = 37293280.

The previous prime is 51278303. The next prime is 51278323. The reversal of 51278315 is 51387215.

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

It is not a de Polignac number, because 51278315 - 2⁴ = 51278299 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 466112 + ... + 466221.

It is an arithmetic number, because the mean of its divisors is an integer number (8391006).

Almost surely, 2^51278315 is an apocalyptic number.

51278315 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51278315 is a deficient number, since it is larger than the sum of its proper divisors (15849733).

51278315 is a wasteful number, since it uses less digits than its factorization.

51278315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932349.

The product of its digits is 8400, while the sum is 32.

The square root of 51278315 is about 7160.8878639454. The cubic root of 51278315 is about 371.5163362976.

Subtracting 51278315 from its reverse (51387215), we obtain a square (108900 = 330²).

The spelling of 51278315 in words is "fifty-one million, two hundred seventy-eight thousand, three hundred fifteen".