51005659 has 4 divisors (see below), whose sum is σ = 51059160. Its totient is φ = 50952160.

The previous prime is 51005653. The next prime is 51005683. The reversal of 51005659 is 95650015.

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 51005659 - 2¹¹ = 51003611 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51005659.

It is not an unprimeable number, because it can be changed into a prime (51005653) 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, 25294 + ... + 27235.

It is an arithmetic number, because the mean of its divisors is an integer number (12764790).

Almost surely, 2^51005659 is an apocalyptic number.

51005659 is a deficient number, since it is larger than the sum of its proper divisors (53501).

51005659 is an equidigital number, since it uses as much as digits as its factorization.

51005659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53500.

The product of its (nonzero) digits is 6750, while the sum is 31.

The square root of 51005659 is about 7141.8246268023. The cubic root of 51005659 is about 370.8566927619.

The spelling of 51005659 in words is "fifty-one million, five thousand, six hundred fifty-nine".