51009787 has 4 divisors (see below), whose sum is σ = 52655296. Its totient is φ = 49364280.

The previous prime is 51009779. The next prime is 51009799. The reversal of 51009787 is 78790015.

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 51009787 - 2³ = 51009779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51009187) 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, 822708 + ... + 822769.

It is an arithmetic number, because the mean of its divisors is an integer number (13163824).

Almost surely, 2^51009787 is an apocalyptic number.

51009787 is a deficient number, since it is larger than the sum of its proper divisors (1645509).

51009787 is a wasteful number, since it uses less digits than its factorization.

51009787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1645508.

The product of its (nonzero) digits is 17640, while the sum is 37.

The square root of 51009787 is about 7142.1136227310. The cubic root of 51009787 is about 370.8666972408.

The spelling of 51009787 in words is "fifty-one million, nine thousand, seven hundred eighty-seven".