712500821 has 16 divisors (see below), whose sum is σ = 763762608. Its totient is φ = 662323200.

The previous prime is 712500751. The next prime is 712500857. The reversal of 712500821 is 128005217.

It can be written as a sum of positive squares in 8 ways, for example, as 305026225 + 407474596 = 17465^2 + 20186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-712500821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (712500881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 808301 + ... + 809181.

It is an arithmetic number, because the mean of its divisors is an integer number (47735163).

Almost surely, 2^712500821 is an apocalyptic number.

It is an amenable number.

712500821 is a deficient number, since it is larger than the sum of its proper divisors (51261787).

712500821 is a wasteful number, since it uses less digits than its factorization.

712500821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 712500821 is about 26692.7110088129. The cubic root of 712500821 is about 893.1583369101.

The spelling of 712500821 in words is "seven hundred twelve million, five hundred thousand, eight hundred twenty-one".