56261521 has 4 divisors (see below), whose sum is σ = 56276532. Its totient is φ = 56246512.

The previous prime is 56261507. The next prime is 56261573. The reversal of 56261521 is 12516265.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12516265 = 5 ⋅2503253.

It can be written as a sum of positive squares in 2 ways, for example, as 43758225 + 12503296 = 6615^2 + 3536^2 .

It is a cyclic number.

It is not a de Polignac number, because 56261521 - 2⁷ = 56261393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56261521.

It is not an unprimeable number, because it can be changed into a prime (56261591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3375 + ... + 11131.

It is an arithmetic number, because the mean of its divisors is an integer number (14069133).

Almost surely, 2^56261521 is an apocalyptic number.

It is an amenable number.

56261521 is a deficient number, since it is larger than the sum of its proper divisors (15011).

56261521 is an equidigital number, since it uses as much as digits as its factorization.

56261521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15010.

The product of its digits is 3600, while the sum is 28.

The square root of 56261521 is about 7500.7680273423. The cubic root of 56261521 is about 383.1808733769.

Adding to 56261521 its reverse (12516265), we get a palindrome (68777786).

The spelling of 56261521 in words is "fifty-six million, two hundred sixty-one thousand, five hundred twenty-one".