51278515 has 8 divisors (see below), whose sum is σ = 61650000. Its totient is φ = 40945632.

The previous prime is 51278453. The next prime is 51278527. The reversal of 51278515 is 51587215.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51278515 is a prime.

It is a super-2 number, since 2×51278515² = 5258972201210450, which contains 22 as substring.

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, 6640 + ... + 12109.

It is an arithmetic number, because the mean of its divisors is an integer number (7706250).

Almost surely, 2^51278515 is an apocalyptic number.

51278515 is a deficient number, since it is larger than the sum of its proper divisors (10371485).

51278515 is a wasteful number, since it uses less digits than its factorization.

51278515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19301.

The product of its digits is 14000, while the sum is 34.

The square root of 51278515 is about 7160.9018286805. The cubic root of 51278515 is about 371.5168193034.

The spelling of 51278515 in words is "fifty-one million, two hundred seventy-eight thousand, five hundred fifteen".