56221351 has 2 divisors, whose sum is σ = 56221352. Its totient is φ = 56221350.

The previous prime is 56221349. The next prime is 56221357. The reversal of 56221351 is 15312265.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56221351 - 2¹ = 56221349 is a prime.

Together with 56221349, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56221357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28110675 + 28110676.

It is an arithmetic number, because the mean of its divisors is an integer number (28110676).

Almost surely, 2^56221351 is an apocalyptic number.

56221351 is a deficient number, since it is larger than the sum of its proper divisors (1).

56221351 is an equidigital number, since it uses as much as digits as its factorization.

56221351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 25.

The square root of 56221351 is about 7498.0898234150. The cubic root of 56221351 is about 383.0896562645.

The spelling of 56221351 in words is "fifty-six million, two hundred twenty-one thousand, three hundred fifty-one".