51662609 has 8 divisors (see below), whose sum is σ = 54862920. Its totient is φ = 48480256.

The previous prime is 51662599. The next prime is 51662617. The reversal of 51662609 is 90626615.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6235009 + 45427600 = 2497^2 + 6740^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 51662609 - 2⁴ = 51662593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51661609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1697 + ... + 10305.

It is an arithmetic number, because the mean of its divisors is an integer number (6857865).

Almost surely, 2^51662609 is an apocalyptic number.

It is an amenable number.

51662609 is a deficient number, since it is larger than the sum of its proper divisors (3200311).

51662609 is a wasteful number, since it uses less digits than its factorization.

51662609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8979.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 51662609 is about 7187.6706240617. The cubic root of 51662609 is about 372.4421098272.

The spelling of 51662609 in words is "fifty-one million, six hundred sixty-two thousand, six hundred nine".