56535721 has 4 divisors (see below), whose sum is σ = 61675344. Its totient is φ = 51396100.

The previous prime is 56535709. The next prime is 56535733. The reversal of 56535721 is 12753565.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (56535709) and next prime (56535733).

It is a cyclic number.

It is not a de Polignac number, because 56535721 - 2¹³ = 56527529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56535751) 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, 2569795 + ... + 2569816.

It is an arithmetic number, because the mean of its divisors is an integer number (15418836).

Almost surely, 2^56535721 is an apocalyptic number.

It is an amenable number.

56535721 is a deficient number, since it is larger than the sum of its proper divisors (5139623).

56535721 is a wasteful number, since it uses less digits than its factorization.

56535721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5139622.

The product of its digits is 31500, while the sum is 34.

The square root of 56535721 is about 7519.0239393155. The cubic root of 56535721 is about 383.8023636666.

The spelling of 56535721 in words is "fifty-six million, five hundred thirty-five thousand, seven hundred twenty-one".