521812723 has 2 divisors, whose sum is σ = 521812724. Its totient is φ = 521812722.

The previous prime is 521812721. The next prime is 521812787. The reversal of 521812723 is 327218125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521812723 - 2¹ = 521812721 is a prime.

Together with 521812721, it forms a pair of twin primes.

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

It is not a weakly prime, because it can be changed into another prime (521812721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260906361 + 260906362.

It is an arithmetic number, because the mean of its divisors is an integer number (260906362).

Almost surely, 2^521812723 is an apocalyptic number.

521812723 is a deficient number, since it is larger than the sum of its proper divisors (1).

521812723 is an equidigital number, since it uses as much as digits as its factorization.

521812723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 31.

The square root of 521812723 is about 22843.2205041233. The cubic root of 521812723 is about 805.0784862327.

The spelling of 521812723 in words is "five hundred twenty-one million, eight hundred twelve thousand, seven hundred twenty-three".