56011621 has 2 divisors, whose sum is σ = 56011622. Its totient is φ = 56011620.

The previous prime is 56011609. The next prime is 56011661. The reversal of 56011621 is 12611065.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47803396 + 8208225 = 6914^2 + 2865^2 .

It is a cyclic number.

It is not a de Polignac number, because 56011621 - 2⁵ = 56011589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 56011592 and 56011601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56011661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28005810 + 28005811.

It is an arithmetic number, because the mean of its divisors is an integer number (28005811).

Almost surely, 2^56011621 is an apocalyptic number.

It is an amenable number.

56011621 is a deficient number, since it is larger than the sum of its proper divisors (1).

56011621 is an equidigital number, since it uses as much as digits as its factorization.

56011621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 56011621 is about 7484.0911939928. The cubic root of 56011621 is about 382.6126992161.

Adding to 56011621 its reverse (12611065), we get a palindrome (68622686).

The spelling of 56011621 in words is "fifty-six million, eleven thousand, six hundred twenty-one".