56503621 has 2 divisors, whose sum is σ = 56503622. Its totient is φ = 56503620.

The previous prime is 56503613. The next prime is 56503627. The reversal of 56503621 is 12630565.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30636225 + 25867396 = 5535^2 + 5086^2 .

It is a cyclic number.

It is not a de Polignac number, because 56503621 - 2³ = 56503613 is a prime.

It is a super-2 number, since 2×56503621² = 6385318372223282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 56503621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56503627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28251810 + 28251811.

It is an arithmetic number, because the mean of its divisors is an integer number (28251811).

Almost surely, 2^56503621 is an apocalyptic number.

It is an amenable number.

56503621 is a deficient number, since it is larger than the sum of its proper divisors (1).

56503621 is an equidigital number, since it uses as much as digits as its factorization.

56503621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 56503621 is about 7516.8890506645. The cubic root of 56503621 is about 383.7297111436.

It can be divided in two parts, 565036 and 21, that multiplied together give a triangular number (11865756 = T₄₈₇₁).

The spelling of 56503621 in words is "fifty-six million, five hundred three thousand, six hundred twenty-one".