55651 has 8 divisors (see below), whose sum is σ = 61200. Its totient is φ = 50400.

The previous prime is 55639. The next prime is 55661. The reversal of 55651 is 15655.

55651 = T₃₄ + T₃₅ + ... + T₇₁.

55651 = 29² + 30² + ... + 57².

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

It is a 5-Lehmer number, since φ(55651) divides (55651-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 55651 - 2⁵ = 55619 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (55621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 501 + ... + 601.

It is an arithmetic number, because the mean of its divisors is an integer number (7650).

2⁵⁵⁶⁵¹ is an apocalyptic number.

55651 is the 106-th centered decagonal number.

55651 is a deficient number, since it is larger than the sum of its proper divisors (5549).

55651 is a wasteful number, since it uses less digits than its factorization.

55651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149.

The product of its digits is 750, while the sum is 22.

The square root of 55651 is about 235.9046417517. The cubic root of 55651 is about 38.1789802398.

The spelling of 55651 in words is "fifty-five thousand, six hundred fifty-one".