51618009 has 8 divisors (see below), whose sum is σ = 68868160. Its totient is φ = 34389936.

The previous prime is 51617983. The next prime is 51618011. The reversal of 51618009 is 90081615.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-51618009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51618019) 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, 1059 + ... + 10215.

It is an arithmetic number, because the mean of its divisors is an integer number (8608520).

Almost surely, 2^51618009 is an apocalyptic number.

It is an amenable number.

51618009 is a deficient number, since it is larger than the sum of its proper divisors (17250151).

51618009 is a wasteful number, since it uses less digits than its factorization.

51618009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11039.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 51618009 is about 7184.5674191283. The cubic root of 51618009 is about 372.3349033405.

The spelling of 51618009 in words is "fifty-one million, six hundred eighteen thousand, nine".