56072221 has 2 divisors, whose sum is σ = 56072222. Its totient is φ = 56072220.

The previous prime is 56072213. The next prime is 56072293. The reversal of 56072221 is 12227065.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32936121 + 23136100 = 5739^2 + 4810^2 .

It is a cyclic number.

It is not a de Polignac number, because 56072221 - 2³ = 56072213 is a prime.

It is equal to p_3342364 and since 56072221 and 3342364 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56075221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28036110 + 28036111.

It is an arithmetic number, because the mean of its divisors is an integer number (28036111).

Almost surely, 2^56072221 is an apocalyptic number.

It is an amenable number.

56072221 is a deficient number, since it is larger than the sum of its proper divisors (1).

56072221 is an equidigital number, since it uses as much as digits as its factorization.

56072221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 56072221 is about 7488.1386872840. The cubic root of 56072221 is about 382.7506347151.

Adding to 56072221 its reverse (12227065), we get a palindrome (68299286).

The spelling of 56072221 in words is "fifty-six million, seventy-two thousand, two hundred twenty-one".