51661327 has 8 divisors (see below), whose sum is σ = 53055632. Its totient is φ = 50284800.

The previous prime is 51661307. The next prime is 51661333. The reversal of 51661327 is 72316615.

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

It is not a de Polignac number, because 51661327 - 2¹⁵ = 51628559 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 (51661307) 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, 1552 + ... + 10282.

It is an arithmetic number, because the mean of its divisors is an integer number (6631954).

Almost surely, 2^51661327 is an apocalyptic number.

51661327 is a deficient number, since it is larger than the sum of its proper divisors (1394305).

51661327 is an equidigital number, since it uses as much as digits as its factorization.

51661327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8889.

The product of its digits is 7560, while the sum is 31.

The square root of 51661327 is about 7187.5814430168. The cubic root of 51661327 is about 372.4390291031.

The spelling of 51661327 in words is "fifty-one million, six hundred sixty-one thousand, three hundred twenty-seven".