51087418 has 4 divisors (see below), whose sum is σ = 76631130. Its totient is φ = 25543708.

The previous prime is 51087391. The next prime is 51087427. The reversal of 51087418 is 81478015.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81478015 = 5 ⋅16295603.

It can be written as a sum of positive squares in only one way, i.e., 27594009 + 23493409 = 5253^2 + 4847^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 12771853 + ... + 12771856.

Almost surely, 2^51087418 is an apocalyptic number.

51087418 is a deficient number, since it is larger than the sum of its proper divisors (25543712).

51087418 is a wasteful number, since it uses less digits than its factorization.

51087418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25543711.

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 51087418 is about 7147.5462922600. The cubic root of 51087418 is about 371.0547406289.

The spelling of 51087418 in words is "fifty-one million, eighty-seven thousand, four hundred eighteen".