51559787 has 4 divisors (see below), whose sum is σ = 54273480. Its totient is φ = 48846096.

The previous prime is 51559777. The next prime is 51559801. The reversal of 51559787 is 78795515.

It is a happy number.

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 51559787 - 2⁴ = 51559771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51559777) 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, 1356818 + ... + 1356855.

It is an arithmetic number, because the mean of its divisors is an integer number (13568370).

Almost surely, 2^51559787 is an apocalyptic number.

51559787 is a deficient number, since it is larger than the sum of its proper divisors (2713693).

51559787 is a wasteful number, since it uses less digits than its factorization.

51559787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2713692.

The product of its digits is 441000, while the sum is 47.

The square root of 51559787 is about 7180.5143966153. The cubic root of 51559787 is about 372.1948602380.

The spelling of 51559787 in words is "fifty-one million, five hundred fifty-nine thousand, seven hundred eighty-seven".