56221547 has 2 divisors, whose sum is σ = 56221548. Its totient is φ = 56221546.

The previous prime is 56221531. The next prime is 56221553. The reversal of 56221547 is 74512265.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56221547 - 2⁴ = 56221531 is a prime.

It is not a weakly prime, because it can be changed into another prime (56224547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28110773 + 28110774.

It is an arithmetic number, because the mean of its divisors is an integer number (28110774).

Almost surely, 2^56221547 is an apocalyptic number.

56221547 is a deficient number, since it is larger than the sum of its proper divisors (1).

56221547 is an equidigital number, since it uses as much as digits as its factorization.

56221547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 32.

The square root of 56221547 is about 7498.1028933991. The cubic root of 56221547 is about 383.0901014422.

The spelling of 56221547 in words is "fifty-six million, two hundred twenty-one thousand, five hundred forty-seven".