51317909 has 8 divisors (see below), whose sum is σ = 51799968. Its totient is φ = 50838480.

The previous prime is 51317891. The next prime is 51317911. The reversal of 51317909 is 90971315.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51317909 - 2¹⁶ = 51252373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51317969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64814 + ... + 65600.

It is an arithmetic number, because the mean of its divisors is an integer number (6474996).

Almost surely, 2^51317909 is an apocalyptic number.

It is an amenable number.

51317909 is a deficient number, since it is larger than the sum of its proper divisors (482059).

51317909 is a wasteful number, since it uses less digits than its factorization.

51317909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315.

The product of its (nonzero) digits is 8505, while the sum is 35.

The square root of 51317909 is about 7163.6519318013. The cubic root of 51317909 is about 371.6119324798.

The spelling of 51317909 in words is "fifty-one million, three hundred seventeen thousand, nine hundred nine".