56021501 has 2 divisors, whose sum is σ = 56021502. Its totient is φ = 56021500.

The previous prime is 56021489. The next prime is 56021521. The reversal of 56021501 is 10512065.

It is an a-pointer prime, because the next prime (56021521) can be obtained adding 56021501 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55517401 + 504100 = 7451^2 + 710^2 .

It is a cyclic number.

It is not a de Polignac number, because 56021501 - 2¹⁰ = 56020477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56021521) 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, 28010750 + 28010751.

It is an arithmetic number, because the mean of its divisors is an integer number (28010751).

Almost surely, 2^56021501 is an apocalyptic number.

It is an amenable number.

56021501 is a deficient number, since it is larger than the sum of its proper divisors (1).

56021501 is an equidigital number, since it uses as much as digits as its factorization.

56021501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 56021501 is about 7484.7512316710. The cubic root of 56021501 is about 382.6351944957.

Adding to 56021501 its reverse (10512065), we get a palindrome (66533566).

The spelling of 56021501 in words is "fifty-six million, twenty-one thousand, five hundred one".