56261221 has 2 divisors, whose sum is σ = 56261222. Its totient is φ = 56261220.

The previous prime is 56261203. The next prime is 56261239. The reversal of 56261221 is 12216265.

It is a balanced prime because it is at equal distance from previous prime (56261203) and next prime (56261239).

It can be written as a sum of positive squares in only one way, i.e., 49702500 + 6558721 = 7050^2 + 2561^2 .

It is a cyclic number.

It is not a de Polignac number, because 56261221 - 2²³ = 47872613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56261281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28130610 + 28130611.

It is an arithmetic number, because the mean of its divisors is an integer number (28130611).

Almost surely, 2^56261221 is an apocalyptic number.

It is an amenable number.

56261221 is a deficient number, since it is larger than the sum of its proper divisors (1).

56261221 is an equidigital number, since it uses as much as digits as its factorization.

56261221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 56261221 is about 7500.7480293635. The cubic root of 56261221 is about 383.1801923047.

Adding to 56261221 its reverse (12216265), we get a palindrome (68477486).

The spelling of 56261221 in words is "fifty-six million, two hundred sixty-one thousand, two hundred twenty-one".