51636709 has 4 divisors (see below), whose sum is σ = 51652480. Its totient is φ = 51620940.

The previous prime is 51636703. The next prime is 51636713. The reversal of 51636709 is 90763615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51636709 - 2⁵ = 51636677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51636703) 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, 927 + ... + 10204.

It is an arithmetic number, because the mean of its divisors is an integer number (12913120).

Almost surely, 2^51636709 is an apocalyptic number.

It is an amenable number.

51636709 is a deficient number, since it is larger than the sum of its proper divisors (15771).

51636709 is a wasteful number, since it uses less digits than its factorization.

51636709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15770.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 51636709 is about 7185.8687018342. The cubic root of 51636709 is about 372.3798606606.

The spelling of 51636709 in words is "fifty-one million, six hundred thirty-six thousand, seven hundred nine".