55821611 has 8 divisors (see below), whose sum is σ = 58090560. Its totient is φ = 53596872.

The previous prime is 55821599. The next prime is 55821613. The reversal of 55821611 is 11612855.

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 55821611 - 2¹⁰ = 55820587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55821613) 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, 8465 + ... + 13538.

It is an arithmetic number, because the mean of its divisors is an integer number (7261320).

Almost surely, 2^55821611 is an apocalyptic number.

55821611 is a deficient number, since it is larger than the sum of its proper divisors (2268949).

55821611 is a wasteful number, since it uses less digits than its factorization.

55821611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22105.

The product of its digits is 2400, while the sum is 29.

The square root of 55821611 is about 7471.3861498386. The cubic root of 55821611 is about 382.1795593263.

The spelling of 55821611 in words is "fifty-five million, eight hundred twenty-one thousand, six hundred eleven".