51816009 has 8 divisors (see below), whose sum is σ = 78957760. Its totient is φ = 29609136.

The previous prime is 51815999. The next prime is 51816019. The reversal of 51816009 is 90061815.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51815999) and next prime (51816019).

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

It is not a de Polignac number, because 51816009 - 2⁴ = 51815993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51816019) 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, 1233694 + ... + 1233735.

It is an arithmetic number, because the mean of its divisors is an integer number (9869720).

Almost surely, 2^51816009 is an apocalyptic number.

It is an amenable number.

51816009 is a deficient number, since it is larger than the sum of its proper divisors (27141751).

51816009 is a wasteful number, since it uses less digits than its factorization.

51816009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2467439.

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

The square root of 51816009 is about 7198.3337655321. Note that the first 3 decimals coincide. The cubic root of 51816009 is about 372.8103720743.

The spelling of 51816009 in words is "fifty-one million, eight hundred sixteen thousand, nine".