51606909 has 16 divisors (see below), whose sum is σ = 78922240. Its totient is φ = 33294240.

The previous prime is 51606899. The next prime is 51606913. The reversal of 51606909 is 90960615.

It is a de Polignac number, because none of the positive numbers 2^k-51606909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51606959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29992 + ... + 31665.

It is an arithmetic number, because the mean of its divisors is an integer number (4932640).

Almost surely, 2^51606909 is an apocalyptic number.

It is an amenable number.

51606909 is a deficient number, since it is larger than the sum of its proper divisors (27315331).

51606909 is a wasteful number, since it uses less digits than its factorization.

51606909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61697 (or 61691 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 51606909 is about 7183.7948884973. The cubic root of 51606909 is about 372.3082123090.

The spelling of 51606909 in words is "fifty-one million, six hundred six thousand, nine hundred nine".