523357921 has 2 divisors, whose sum is σ = 523357922. Its totient is φ = 523357920.

The previous prime is 523357909. The next prime is 523357927. The reversal of 523357921 is 129753325.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 494617600 + 28740321 = 22240^2 + 5361^2 .

It is a cyclic number.

It is not a de Polignac number, because 523357921 - 2¹⁷ = 523226849 is a prime.

It is not a weakly prime, because it can be changed into another prime (523357927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261678960 + 261678961.

It is an arithmetic number, because the mean of its divisors is an integer number (261678961).

Almost surely, 2^523357921 is an apocalyptic number.

It is an amenable number.

523357921 is a deficient number, since it is larger than the sum of its proper divisors (1).

523357921 is an equidigital number, since it uses as much as digits as its factorization.

523357921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56700, while the sum is 37.

The square root of 523357921 is about 22877.0173099554. The cubic root of 523357921 is about 805.8723724341.

The spelling of 523357921 in words is "five hundred twenty-three million, three hundred fifty-seven thousand, nine hundred twenty-one".