712540321 has 4 divisors (see below), whose sum is σ = 725984532. Its totient is φ = 699096112.

The previous prime is 712540313. The next prime is 712540327. The reversal of 712540321 is 123045217.

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 578883600 + 133656721 = 24060^2 + 11561^2 .

It is a cyclic number.

It is not a de Polignac number, because 712540321 - 2³ = 712540313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (712540327) 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, 6722026 + ... + 6722131.

It is an arithmetic number, because the mean of its divisors is an integer number (181496133).

Almost surely, 2^712540321 is an apocalyptic number.

It is an amenable number.

712540321 is a deficient number, since it is larger than the sum of its proper divisors (13444211).

712540321 is a wasteful number, since it uses less digits than its factorization.

712540321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13444210.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 712540321 is about 26693.4509009232. The cubic root of 712540321 is about 893.1748417343.

Adding to 712540321 its reverse (123045217), we get a palindrome (835585538).

The spelling of 712540321 in words is "seven hundred twelve million, five hundred forty thousand, three hundred twenty-one".