51612009 has 4 divisors (see below), whose sum is σ = 68816016. Its totient is φ = 34408004.

The previous prime is 51612007. The next prime is 51612031. The reversal of 51612009 is 90021615.

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 51612009 - 2¹ = 51612007 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51612009.

It is not an unprimeable number, because it can be changed into a prime (51612007) 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, 8601999 + ... + 8602004.

It is an arithmetic number, because the mean of its divisors is an integer number (17204004).

Almost surely, 2^51612009 is an apocalyptic number.

It is an amenable number.

51612009 is a deficient number, since it is larger than the sum of its proper divisors (17204007).

51612009 is a wasteful number, since it uses less digits than its factorization.

51612009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17204006.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 51612009 is about 7184.1498453192. The cubic root of 51612009 is about 372.3204762311.

The spelling of 51612009 in words is "fifty-one million, six hundred twelve thousand, nine".