523507421 has 2 divisors, whose sum is σ = 523507422. Its totient is φ = 523507420.

The previous prime is 523507409. The next prime is 523507459. The reversal of 523507421 is 124705325.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 519201796 + 4305625 = 22786^2 + 2075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-523507421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (523501421) 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, 261753710 + 261753711.

It is an arithmetic number, because the mean of its divisors is an integer number (261753711).

Almost surely, 2^523507421 is an apocalyptic number.

It is an amenable number.

523507421 is a deficient number, since it is larger than the sum of its proper divisors (1).

523507421 is an equidigital number, since it uses as much as digits as its factorization.

523507421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 523507421 is about 22880.2845480558. The cubic root of 523507421 is about 805.9490990520.

The spelling of 523507421 in words is "five hundred twenty-three million, five hundred seven thousand, four hundred twenty-one".