56021549 has 2 divisors, whose sum is σ = 56021550. Its totient is φ = 56021548.

The previous prime is 56021543. The next prime is 56021551. The reversal of 56021549 is 94512065.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55875625 + 145924 = 7475^2 + 382^2 .

It is a cyclic number.

It is not a de Polignac number, because 56021549 - 2²⁴ = 39244333 is a prime.

Together with 56021551, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56021543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28010774 + 28010775.

It is an arithmetic number, because the mean of its divisors is an integer number (28010775).

Almost surely, 2^56021549 is an apocalyptic number.

It is an amenable number.

56021549 is a deficient number, since it is larger than the sum of its proper divisors (1).

56021549 is an equidigital number, since it uses as much as digits as its factorization.

56021549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 56021549 is about 7484.7544381897. The cubic root of 56021549 is about 382.6353037780.

The spelling of 56021549 in words is "fifty-six million, twenty-one thousand, five hundred forty-nine".