532491721 has 4 divisors (see below), whose sum is σ = 532964500. Its totient is φ = 532018944.

The previous prime is 532491671. The next prime is 532491727. The reversal of 532491721 is 127194235.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 188760121 + 343731600 = 13739^2 + 18540^2 .

It is a cyclic number.

It is not a de Polignac number, because 532491721 - 2¹⁷ = 532360649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (532491727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234696 + ... + 236953.

It is an arithmetic number, because the mean of its divisors is an integer number (133241125).

Almost surely, 2^532491721 is an apocalyptic number.

It is an amenable number.

532491721 is a deficient number, since it is larger than the sum of its proper divisors (472779).

532491721 is a wasteful number, since it uses less digits than its factorization.

532491721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472778.

The product of its digits is 15120, while the sum is 34.

The square root of 532491721 is about 23075.7821319235. The cubic root of 532491721 is about 810.5334701486.

The spelling of 532491721 in words is "five hundred thirty-two million, four hundred ninety-one thousand, seven hundred twenty-one".