55771321 has 8 divisors (see below), whose sum is σ = 59254920. Its totient is φ = 52391808.

The previous prime is 55771273. The next prime is 55771337. The reversal of 55771321 is 12317755.

It can be written as a sum of positive squares in 4 ways, for example, as 27415696 + 28355625 = 5236^2 + 5325^2 .

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 55771321 - 2⁹ = 55770809 is a prime.

It is a super-2 number, since 2×55771321² = 6220880492170082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55771361) 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, 24916 + ... + 27061.

It is an arithmetic number, because the mean of its divisors is an integer number (7406865).

Almost surely, 2^55771321 is an apocalyptic number.

It is an amenable number.

55771321 is a deficient number, since it is larger than the sum of its proper divisors (3483599).

55771321 is a wasteful number, since it uses less digits than its factorization.

55771321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52043.

The product of its digits is 7350, while the sum is 31.

The square root of 55771321 is about 7468.0198848155. The cubic root of 55771321 is about 382.0647556130.

The spelling of 55771321 in words is "fifty-five million, seven hundred seventy-one thousand, three hundred twenty-one".