727056521 has 4 divisors (see below), whose sum is σ = 727329792. Its totient is φ = 726783252.

The previous prime is 727056509. The next prime is 727056523. The reversal of 727056521 is 125650727.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 727056521 - 2⁶ = 727056457 is a prime.

It is a super-2 number, since 2×727056521² = 1057222369457246882, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (727056523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132605 + ... + 137978.

It is an arithmetic number, because the mean of its divisors is an integer number (181832448).

Almost surely, 2^727056521 is an apocalyptic number.

It is an amenable number.

727056521 is a deficient number, since it is larger than the sum of its proper divisors (273271).

727056521 is a wasteful number, since it uses less digits than its factorization.

727056521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273270.

The product of its (nonzero) digits is 29400, while the sum is 35.

The square root of 727056521 is about 26963.9856289830. The cubic root of 727056521 is about 899.1995026188.

The spelling of 727056521 in words is "seven hundred twenty-seven million, fifty-six thousand, five hundred twenty-one".