712345721 has 4 divisors (see below), whose sum is σ = 712457844. Its totient is φ = 712233600.

The previous prime is 712345709. The next prime is 712345727. The reversal of 712345721 is 127543217.

712345721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127543217 = 4253 ⋅29989.

It can be written as a sum of positive squares in 2 ways, for example, as 594384400 + 117961321 = 24380^2 + 10861^2 .

It is a cyclic number.

It is not a de Polignac number, because 712345721 - 2⁶ = 712345657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (712345727) 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, 45920 + ... + 59441.

It is an arithmetic number, because the mean of its divisors is an integer number (178114461).

Almost surely, 2^712345721 is an apocalyptic number.

It is an amenable number.

712345721 is a deficient number, since it is larger than the sum of its proper divisors (112123).

712345721 is a wasteful number, since it uses less digits than its factorization.

712345721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112122.

The product of its digits is 11760, while the sum is 32.

The square root of 712345721 is about 26689.8055631734. The cubic root of 712345721 is about 893.0935234592.

Adding to 712345721 its reverse (127543217), we get a palindrome (839888938).

The spelling of 712345721 in words is "seven hundred twelve million, three hundred forty-five thousand, seven hundred twenty-one".