536456721 has 4 divisors (see below), whose sum is σ = 715275632. Its totient is φ = 357637812.

The previous prime is 536456717. The next prime is 536456729. The reversal of 536456721 is 127654635.

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 not a de Polignac number, because 536456721 - 2² = 536456717 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 536456721.

It is not an unprimeable number, because it can be changed into a prime (536456729) 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, 89409451 + ... + 89409456.

It is an arithmetic number, because the mean of its divisors is an integer number (178818908).

Almost surely, 2^536456721 is an apocalyptic number.

It is an amenable number.

536456721 is a deficient number, since it is larger than the sum of its proper divisors (178818911).

536456721 is a wasteful number, since it uses less digits than its factorization.

536456721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178818910.

The product of its digits is 151200, while the sum is 39.

The square root of 536456721 is about 23161.5353765678. The cubic root of 536456721 is about 812.5402752738.

The spelling of 536456721 in words is "five hundred thirty-six million, four hundred fifty-six thousand, seven hundred twenty-one".