51279539 has 4 divisors (see below), whose sum is σ = 51299256. Its totient is φ = 51259824.

The previous prime is 51279533. The next prime is 51279563. The reversal of 51279539 is 93597215.

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 51279539 - 2⁴ = 51279523 is a prime.

It is a super-2 number, since 2×51279539² = 5259182240105042, 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 = 51279496 and 51279505.

It is not an unprimeable number, because it can be changed into a prime (51279533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5234 + ... + 11399.

It is an arithmetic number, because the mean of its divisors is an integer number (12824814).

Almost surely, 2^51279539 is an apocalyptic number.

51279539 is a deficient number, since it is larger than the sum of its proper divisors (19717).

51279539 is a wasteful number, since it uses less digits than its factorization.

51279539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19716.

The product of its digits is 85050, while the sum is 41.

The square root of 51279539 is about 7160.9733276978. The cubic root of 51279539 is about 371.5192922734.

The spelling of 51279539 in words is "fifty-one million, two hundred seventy-nine thousand, five hundred thirty-nine".