51661027 has 4 divisors (see below), whose sum is σ = 56357496. Its totient is φ = 46964560.

The previous prime is 51661003. The next prime is 51661063. The reversal of 51661027 is 72016615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51661027 - 2⁷ = 51660899 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51660986 and 51661004.

It is not an unprimeable number, because it can be changed into a prime (51661067) 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 3 ways as a sum of consecutive naturals, for example, 2348218 + ... + 2348239.

It is an arithmetic number, because the mean of its divisors is an integer number (14089374).

Almost surely, 2^51661027 is an apocalyptic number.

51661027 is a deficient number, since it is larger than the sum of its proper divisors (4696469).

51661027 is a wasteful number, since it uses less digits than its factorization.

51661027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4696468.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 51661027 is about 7187.5605736578. The cubic root of 51661027 is about 372.4383081775.

The spelling of 51661027 in words is "fifty-one million, six hundred sixty-one thousand, twenty-seven".