51285309 has 8 divisors (see below), whose sum is σ = 68433120. Its totient is φ = 34163856.

The previous prime is 51285259. The next prime is 51285343. The reversal of 51285309 is 90358215.

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

It is not a de Polignac number, because 51285309 - 2⁸ = 51285053 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51285309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51285109) 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, 1482 + ... + 10235.

It is an arithmetic number, because the mean of its divisors is an integer number (8554140).

Almost surely, 2^51285309 is an apocalyptic number.

It is an amenable number.

51285309 is a deficient number, since it is larger than the sum of its proper divisors (17147811).

51285309 is a wasteful number, since it uses less digits than its factorization.

51285309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13179.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 51285309 is about 7161.3761945593. The cubic root of 51285309 is about 371.5332262645.

The spelling of 51285309 in words is "fifty-one million, two hundred eighty-five thousand, three hundred nine".