51994587 has 4 divisors (see below), whose sum is σ = 69326120. Its totient is φ = 34663056.

The previous prime is 51994573. The next prime is 51994589. The reversal of 51994587 is 78549915.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51994587 - 2⁴ = 51994571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51994589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8665762 + ... + 8665767.

It is an arithmetic number, because the mean of its divisors is an integer number (17331530).

Almost surely, 2^51994587 is an apocalyptic number.

51994587 is a deficient number, since it is larger than the sum of its proper divisors (17331533).

51994587 is a wasteful number, since it uses less digits than its factorization.

51994587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17331532.

The product of its digits is 453600, while the sum is 48.

The square root of 51994587 is about 7210.7272171398. The cubic root of 51994587 is about 373.2381638971.

The spelling of 51994587 in words is "fifty-one million, nine hundred ninety-four thousand, five hundred eighty-seven".