56220311 has 4 divisors (see below), whose sum is σ = 64251792. Its totient is φ = 48188832.

The previous prime is 56220301. The next prime is 56220313. The reversal of 56220311 is 11302265.

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 56220311 - 2⁶ = 56220247 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 (56220313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4015730 + ... + 4015743.

It is an arithmetic number, because the mean of its divisors is an integer number (16062948).

Almost surely, 2^56220311 is an apocalyptic number.

56220311 is a deficient number, since it is larger than the sum of its proper divisors (8031481).

56220311 is an equidigital number, since it uses as much as digits as its factorization.

56220311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8031480.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 56220311 is about 7498.0204720980. The cubic root of 56220311 is about 383.0872940794.

Adding to 56220311 its reverse (11302265), we get a palindrome (67522576).

The spelling of 56220311 in words is "fifty-six million, two hundred twenty thousand, three hundred eleven".