56361221 has 6 divisors (see below), whose sum is σ = 65563110. Its totient is φ = 48309576.

The previous prime is 56361199. The next prime is 56361241. The reversal of 56361221 is 12216365.

It can be written as a sum of positive squares in only one way, i.e., 56100100 + 261121 = 7490^2 + 511^2 .

It is not a de Polignac number, because 56361221 - 2¹⁰ = 56360197 is a prime.

It is a super-2 number, since 2×56361221² = 6353174465221682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56361241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 575066 + ... + 575163.

It is an arithmetic number, because the mean of its divisors is an integer number (10927185).

Almost surely, 2^56361221 is an apocalyptic number.

It is an amenable number.

56361221 is a deficient number, since it is larger than the sum of its proper divisors (9201889).

56361221 is a wasteful number, since it uses less digits than its factorization.

56361221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150243 (or 1150236 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

The square root of 56361221 is about 7507.4110717344. The cubic root of 56361221 is about 383.4070823869.

Adding to 56361221 its reverse (12216365), we get a palindrome (68577586).

The spelling of 56361221 in words is "fifty-six million, three hundred sixty-one thousand, two hundred twenty-one".