51345787 has 4 divisors (see below), whose sum is σ = 51362136. Its totient is φ = 51329440.

The previous prime is 51345779. The next prime is 51345799. The reversal of 51345787 is 78754315.

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 51345787 - 2³ = 51345779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51345727) 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, 1813 + ... + 10294.

It is an arithmetic number, because the mean of its divisors is an integer number (12840534).

Almost surely, 2^51345787 is an apocalyptic number.

51345787 is a deficient number, since it is larger than the sum of its proper divisors (16349).

51345787 is a wasteful number, since it uses less digits than its factorization.

51345787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16348.

The product of its digits is 117600, while the sum is 40.

The square root of 51345787 is about 7165.5974628777. The cubic root of 51345787 is about 371.6792119297.

The spelling of 51345787 in words is "fifty-one million, three hundred forty-five thousand, seven hundred eighty-seven".